The instrument cluster dimmer switch does not respond and the back lights are out. What could be the problem?

Looks like fuses 30 and 41

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Buick Rendezvous (2002-2007) fuses and relays

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Fuse box diagram - Fuse Box Location. It is located in the passenger's side of the center console near the floor, behind the cover.

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Before you start replacing parts ,need a little more information . Maybe able to save you some time an money . Does the horn work when you push the horn button , does the air bag light stay lit in the instrument cluster ? The button lights for the bottons on the steering wheel are lit by the BCM - body control module . Interior Lamps Dimming
The second group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and incandescent lamps.
When the ignition switch is turned to the RUN position, the radio's vacuum fluorescent (VF) displays turn on at maximum brightness. When the park lamps are on, all incandescent back lighting turn on at the dimming level indicated by the I/P dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. The panel dimmer switch potentiometer is an input to the BCM. When the driver selects a dimming setting by moving the I/P dimming switch potentiometer, all incandescent back lighting lamps are provided with a specific voltage. When the I/P dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent back lighting respond from minimum intensity to maximum brightness in response to the I/P dimmer switch.
The following switches and components have back lighting when the park lamps are on:
• The instrument panel cluster (IPC)
• Radio, front and rear
• Window and heated seat switches
• Garage door opener switch
• Selectable ride switch
• Roof beacon switch
• Power take off (PTO) switch
• Headlamp leveling switch
• Rear wheel steering mode select switch
• HVAC control assembly
• Headlamp and panel dimmer switch
• Transfer case shift control switch
• PSIR disable switch
• PRNDL lamps
• Traction control switch
• Steering wheel control switches
• Fog lamp switches

Could be the clock spring inside the steering coulmn ,under the steering wheel if horn doesn't work ,air bag light lit etc...

All of these are not working ? Instrument Cluster and Panel Illumination The non-dimmable lighting system illuminates the following components:

• Roof opening panel control switch
• Window control switches
• Door lock control switches
• Sliding backlite window control switch

The dimmable panel lighting system illuminates the following components:

• Adjustable pedal switch
• Manual climate control assembly
• Electronic automatic temperature control (EATC) assembly
• Headlamp switch
• Instrument cluster
• Message center switch
• Audio unit
• Steering wheel audio and climate control switches
• Speed control switches
• Digital versatile disc (DVD) player
• Floor shifter
• Parking aid switch
• Four wheel drive (4WD) switch
• Traction control switch

The instrument panel dimmer switch is a contact switch that signals the desired level of brightness sent to the instrument cluster and dimmable components.
You checked all the fuse's ?

1. Visual Inspection Chart Mechanical Electrical
   • Headlamp switch
   • Central junction box (CJB) fuse(s):
     • 6 (15A)
     • 22 (10A)
   • CJB circuit breaker 401 (30A)
   • Auxiliary relay box 1 fuse 1 (5A)
   • Circuitry
   • Headlamp switch
   • Instrument panel dimmer switch
   • Clockspring
   • Illumination source(s)
   • CJB

Did you check these fuse's in the central junction box and

• Auxiliary relay box 1 fuse 1 (5A) You don't need to check them all ,just the right one's . How did you check them ? pull them out an look ?
• Principles of Operation
  Dimmable Illumination With the parking lamps ON, voltage is supplied to the instrument panel dimmer switch (part of the headlamp switch). The instrument panel dimmer switch then sends a variable pulse width modulated (PWM) voltage to the instrument cluster and other dimmable switches and components.
  Fixed Illumination With the ignition switch in the START or RUN position, the delay accessory relay provides voltage to the non-dimmable switches. The delay accessory relay is controlled through the instrument cluster.
  

Could be the instrument cluster .GM had instrument cluster problems for 2003 to 2006 . Wouldn't think BCM reprogramming to be an issue . Having a qualified repair shop or dealer check for DTC'S - diagnostic trouble codes an view data parmeters would be the first place to start .
When the ignition switch is turned to the RUN position, the instrument panel cluster (IPC), radio VF display, and the HVAC control assembly turns ON at maximum brightness. When the headlamp switch is in the PARK or HEADLAMP ON position, all incandescent and LED back lighting turn ON at the dimming level indicated by the instrument panel (I/P) dimmer switch. The dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The BCM supplies a voltage reference through the I/P dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired brightness position, reference voltage is applied through the dimmer switch rheostat and the I/P lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the I/P lamps supply voltage circuits and the LED dimming supply circuit to all related interior lamps, illuminating them to the desired level of brightness.

DTC B2652
Circuit/System Description
The BCM supplies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimmer switch, which is part of the headlamp switch. When the dimmer switch is placed in a desired position, reference voltage is applied through the dimmer switch rheostat and the I/P lamps dimmer switch signal circuit to the BCM. The BCM interprets this voltage signal, then applies a pulse width modulated (PWM) voltage through the instrument panel lamp supply voltage circuit illuminating the components listed below:
• Headlamp switch
• Instrument panel cluster (IPC)
• Driver and passenger window switches
• Driver and passenger door lock switches
• Outside rearview mirror switch

Circuit/System Testing
Ignition OFF, disconnect the (C2) harness connector at the BCM.
Verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
? If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the supply voltage circuits listed below for a short to ground.
• Instrument panel lamp supply voltage circuit terminal 3 C2
• Instrument panel lamp supply voltage circuit terminal 3 C6
Ignition OFF, disconnect all of the instrument panel lamp components fed by the BCM supply voltage circuits listed below.
• Instrument panel supply voltage circuit -terminal 3 C2
• Instrument panel supply voltage circuit -terminal 3 C6
Ignition ON, with a scan tool clear the DTC.
Operate the vehicle within the conditions for running the DTC and verify the DTC does not reset.
? If the DTC resets, test the instrument panel lamp supply voltage circuit for a short to ground. If the circuit test normal, replace the BCM.
Reconnect each component one at a time and verify that the DTC does not reset as current.
? If the DTC resets as current, test or replace the component responsible for setting the DTC.
DTC B3600
DTC B1395 03 : Device Voltage Output 1 Circuit Voltage Below Threshold
DTC B1395 07 : Device Voltage Output 1 Circuit Voltage Above Threshold

Interior Backlighting Malfunction
Diagnostic Fault Information
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
I/P Dimming Voltage Reference
B1395 03, B3600 03
B1395 03
1, 2
--
Instrument Panel Lamps Dimmer Switch Signal
B3600 03
B3600 03
1, 2
--
Instrument Panel Lamp Supply Voltage
B2652 00
1
1
--
LED Dimming Supply
B2610 00
2
2
--
Headlamp Switch Ground
--
3
--
--
Instrument Panel Lamps Malfunction
LED Malfunction
Headlamps and Dimmer Switch Malfunction

dash lights it doesn't seem to be as bright as it used to ???? Dimmer switch on full bright ? Visual Inspection Chart Electrical

• Bulbs
• Central junction box (CJB) fuse 24 (15A)
• Circuitry
• Vehicle security module (if equipped with RKE)
• Instrument cluster
• Door ajar switches

Interior Lighting The interior lamp system is separated into 2 subsystems: the interior lamp subsystem and the on-demand lamp subsystem. The dome light and front map light on-demand lamps are also part of the interior lamp subsystem.
An on-demand interior lamp will only illuminate when its specific switch is activated. On-demand lamps consist of the front map light and the dome light.
The instrument cluster illuminates the interior lamps when any door is ajar, when an unlock signal is received by the vehicle security module (if equipped with remote keyless entry (RKE) or the dimmer switch is rotated to the ON position. The instrument cluster will turn off the interior lamps when all doors are closed, the vehicle security module (if equipped with RKE) receives a lock signal, 25 seconds have elapsed since the illuminated entry feature was activated, or the dimmer switch is rotated to the OFF position.
The vehicle is also equipped with a battery saver feature. The battery saver feature provides automatic shutoff of the demand lamps, courtesy lamps, and the warning chimes after a specific period of time has elapsed in order to save battery power.

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

1. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
   • check that the program card is correctly installed.
   • check the connections to the vehicle.
   • check the ignition switch position.

1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.

1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
   • CAN, ISO or UBP circuits fault; all electronic control units no response/not equipped, refer to Section 418-00 .
   • No response/not equipped for instrument cluster, refer to Section 413-01 .
   • No response/not equipped for vehicle security module, refer to Section 419-10 .
   • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the instrument cluster.
   • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the vehicle security module.

1. If the DTCs retrieved are related to the concern, go to the Instrument Cluster Diagnostic Trouble Code (DTC) Index or the Vehicle Security Module Diagnostic Trouble Code (DTC) Index.

1. If no DTCs related to the concern are retrieved, GO to Symptom Chart .
2. Symptom Chart Condition Possible Sources Action
   • The interior lamps are inoperative
   • Fuse
   • Circuitry
   • Instrument cluster
   • Dimmer control switch
   • Go To Pinpoint Test A .
   Pinpoint Test A: The Interior Lamps Are Inoperative
   Normal Operation On vehicles equipped with remote keyless entry (RKE), the door ajar switches are hardwired to the vehicle security module. The vehicle security module monitors the status of all door ajar switches, and when a door is opened, transmits a dome lamp ON signal to the instrument cluster through UART based protocol (UBP) circuit 1906 (PK), indicating a door has been opened. When the instrument cluster receives the dome lamp ON signal from the vehicle security module, the instrument cluster energizes the interior lamp circuits, which illuminates the interior lamps and, if equipped, the puddle lamps in the exterior mirrors.
   On vehicles without RKE, the door ajar switches are hardwired to the instrument cluster. When the driver or passenger door is opened, the instrument cluster receives a ground signal from the driver door ajar switch through circuit 344 (BK/YE), or from the passenger door ajar switch through circuit 345 (BK/PK), and the instrument cluster energizes the interior lamp circuits, causing the interior lamps to illuminate.
   The dimmer control switch can be used to turn the interior lamps ON or OFF when the doors are closed. The interior lamp defeat switch can be used to turn the interior lamps OFF when the doors are open.
   
   Possible Causes
   • Fuse
   • Circuit 53 (BK/LB) open or short to ground
   • Circuit 57 (BK) open
   • Circuit 402 (OG/LG) open
   • Circuit 1405 (LB/BK) short to ground
   • Circuit 3049 (BK/LG) open
   • Dimmer control switch
   • Instrument cluster
   PINPOINT TEST A: THE INTERIOR LAMPS ARE INOPERATIVE
3. PINPOINT TEST A: THE INTERIOR LAMPS ARE INOPERATIVE Test Step Result / Action to Take A1 CHECK THE INTERIOR LAMP OPERATION AT THE DIMMER CONTROL SWITCH
   • Close all doors.
   • Operate the interior lamps with the instrument panel dimmer control switch.
   • Do any interior lamps illuminate?
   Yes
   For vehicles without RKE, REFER to Section 413-01 .
   
   For vehicles with RKE, REFER to Section 419-10 .
   
   No
   GO to A2 . A2 CHECK FOR INSTRUMENT CLUSTER OR VEHICLE SECURITY MODULE DIAGNOSTIC TROUBLE CODES (DTCs)
   • Key in ON position.
   • Carry out the instrument cluster On-Demand Self Test.
   • For vehicles equipped with remote keyless entry (RKE), carry out the vehicle security module On-Demand Self Test.
   • Were instrument cluster DTCs B2499 or B2659, or if equipped with RKE, vehicle security module DTC U1950 present?
   Yes
   For instrument cluster DTC B2499, GO to A5 .
   
   For instrument cluster DTC B2659, GO to A9 .
   
   If equipped with RKE and vehicle security module and DTC U1950 is present, REFER to Section 418-00 to diagnose the UBP network concern before attempting to diagnose the interior lighting concern.
   
   No
   GO to A3 . A3 CHECK CIRCUIT 3049 (BK/LG) FOR AN OPEN
   • Key in OFF position.
   • Disconnect: Instrument Cluster C220b.
   • Measure the voltage between the instrument cluster C220b-9, circuit 3049 (BK/LG), harness side and ground.
   • Is the voltage greater than 10 volts?
   Yes
   GO to A4 .
   
   No
   VERIFY the central junction box (CJB) fuse 21 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. A4 CHECK INSTRUMENT CLUSTER CIRCUIT 57 (BK) FOR AN OPEN
   • Disconnect: Instrument Cluster C220a.
   • Measure the resistance between the instrument cluster C220a-17, circuit 57 (BK), harness side and ground.
   • Is the resistance less than 5 ohms?
   Yes
   GO to A5 .
   
   No
   REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. A5 CHECK CIRCUIT 53 (BK/LB) FOR AN OPEN
   • NOTE: If the fuse fails, repair circuit 53 (BK/LB) for a short to ground.
   • Connect a fused (15A) jumper wire between the instrument cluster C220b-9, circuit 3049 (BK/LG), harness side and the instrument cluster C220b-8, circuit 53 (BK/LB), harness side.
   • Do the interior lamps illuminate?
   Yes
   REMOVE the jumper wire. GO to A6 .
   
   No
   REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. A6 CHECK THE DIMMER CONTROL SWITCH OPERATION
   • Connect: Instrument Cluster C220a.
   • Disconnect: Dimmer Control Switch C205b.
   • Connect a fused (15A) jumper wire between the dimmer control switch C205b-4, circuit 57 (BK) and the dimmer control switch C205b-2, circuit 402 (OG/LG).
   • Do the interior lamps operate?
   Yes
   INSTALL a new dimmer control switch. REFER to Section 417-01 . TEST the system for normal operation.
   
   No
   GO to A7 . A7 CHECK CIRCUIT 402 (OG/LG) FOR AN OPEN
   • Disconnect: Instrument Cluster C220a.
   • Measure the resistance between the instrument cluster C220a-12, circuit 402 (OG/LG), harness side and the dimmer control switch C205b-2, circuit 402 (OG/LG), harness side.
   • Is the resistance less than 5 ohms?
   Yes
   GO to A8 .
   
   No
   REPAIR the circuit. TEST the system for normal operation. A8 CHECK DIMMER CONTROL SWITCH CIRCUIT 57 (BK) FOR AN OPEN
   • Measure the resistance between the dimmer control switch C205b-4, circuit 57 (BK), harness side and ground.
   • Is the resistance less than 5 ohms?
   Yes
   GO to A11 .
   
   No
   REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. A9 CHECK CIRCUIT 1405 (LB/BK) FOR A SHORT TO GROUND
   • Key in OFF position.
   • Disconnect: Instrument Cluster C220a.
   • Disconnect: Dimmer Control Switch C205b.
   • Measure the resistance between the instrument cluster C220a-11, circuit 1405 (LB/BK), harness side and ground.
   • Is the resistance greater than 10,000 ohms?
   Yes
   GO to A10 .
   
   No
   REPAIR the circuit. TEST the system for normal operation. A10 CHECK THE DIMMER CONTROL SWITCH
   • Carry out the dimmer control switch component test. Refer to Wiring Diagrams Cell 149 for schematic and connector information.
   • Is the dimmer control switch OK?
   Yes
   GO to A11 .
   
   No
   INSTALL a new dimmer control switch. TEST the system for normal operation. A11 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
   • Disconnect all instrument cluster connectors.
   • Check for:
     • corrosion
     • pushed-out pins
   • Connect all instrument cluster connectors and make sure they seat correctly.
   • Operate the system and verify the concern is still present.
   • Is the concern still present?
   Yes
   INSTALL a new instrument cluster. REFER to Section 413-01 . TEST the system for normal operation.
   
   No
   The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation

Back lighting or warning lights ? check engine , ABS , air bags , seat belt , oil light etc... ?
Interior Lamps Dimming
The second group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and incandescent lamps.
• Power window switches
• HVAC control head assembly
• Radio
• The instrument panel cluster (IPC)
When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) display (radio) turns on at maximum brightness. When the park lamps are ON all incandescent back lighting turn ON at the dimming level indicated by the IP dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. When the headlamp switch is placed in the PARK position, the park lamp supply voltage circuit provides an input to the body control module (BCM). The BCM then supplies voltage to the instrument panel dimmer switch through the instrument panel dimming lamps control circuit. The setting of the instrument panel dimmer switch determines the amount of voltage that the instrument panel dimmer switch supplies to the BCM through the instrument panel dimming lamps low reference circuit. The BCM then sends a pulse width modulated (PWM) voltage to all the interior lamps. All the vacuum florescent (VF) and incandescent back lighting lamps are provided a specific voltage and are then grounded. When the headlight switch is turned to the PARK or HEADLAMP position, all incandescent back lighting turn on at the dimming level indicated by the IP dimmer switch. When the IP dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent back lighting respond from Minimum intensity to maximum brightness in response to the IP dimmer switch.

I would have it checked for DTC'S - diagnostic trouble codes stored in the BCM !
DTC B2624 Display Dimming Input Range/Performance
The body control module (BCM) supplies voltage to the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit. The dimmer switch varies the voltage and returns the new voltage to the BCM through the dimmer switch signal return circuit. The BCM uses this voltage to determine the illumination level of the instrument panel lamps.

DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit Range/Performance
The body control module (BCM) receives a variable voltage from the instrument panel (I/P) lamp dimmer switch. The BCM uses this signal in order to vary the illumination level of the I/P lamps. The I/P dimming lamps output from the BCM is a pulse width modulated voltage supply used to light the I/P lamps. If a malfunction occurs in the I/P dimming lamps output circuit, this DTC is set.

DTC B2662 Park Lamp Switch Circuit Malfunction
The park lamps are controlled by the turn/headlamp switch. Positive battery voltage is supplied to the switch through the EXT LP fuse. When the turn/headlamp switch is placed in the park or head position, battery voltage is supplied to the park lamps. The body control module (BCM) is also connected to the park lamp circuit to sense whether or not the park lamps turn ON when the low beam or high beam headlamps are turned ON. The BCM also uses the parklamp battery positive voltage to power the instrument panel (I/P) dimmer output circuit. If the BCM senses that the low beam or high beam headlamps are ON and the park lamp input is not active, DTC B2662 sets.
Do the park lamps work ?

This is more than likely an internal fault in the instrument cluster since the other lights stay bright and you can control them. I suspect that you may need to remove the cluster and have it rebuilt to cure this problem

Are these the lights you are talking about ?
Instrument Cluster and Panel Illumination The instrument cluster and panel illumination is used to provide backlighting to the instrument panel, switches, and control components when the headlamp switch is in either the PARKING LAMPS ON or HEADLAMPS ON position. The level of intensity is adjustable by rotating the instrument panel dimmer switch either up to increase intensity or down to decrease intensity.
Fixed Backlighting When the accessory delay relay is energized, switched voltage is supplied to the non-dimmable components and switches.
Dimmable Backlighting When the parking lamps or the headlamps are in the ON position the smart junction box (SJB) monitors the input from the instrument panel dimmer switch. The SJB sends a pulse-width modulated (PWM) voltage to the dimmable components and switches based on input received from the instrument panel dimmer switch. The SJB also sends a message over the controller area network (CAN) to the audio unit, and the instrument cluster to indicate the backlighting intensity level.
If you don't know about PWM an smart junction box your better off taking your vehicle to a quailified repair shop ! You don't the diagnostic tools or technical information . May have DTC'S - diagnostic trouble codes stored in the SJB (computer ). Do you know where SJB is located ?
Visual Inspection Chart Electrical

• Smart junction box (SJB) fuse 23 (15A)
• Bulb(s)
• Circuitry
• Connectors
• Illumination source(s)
• Auxiliary climate control switches (if equipped)
• Door lock control switches
• Window control switches
• Headlamp switch
• Dual electronic automatic temperature control (DEATC) module
• Audio unit
• SJB
• Instrument cluster

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

1. If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:

• check that the program card is correctly installed.
• check the connections to the vehicle.
• check the ignition switch position.

1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.

1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:

• CAN circuits fault; all electronic control units no response/not equipped, refer to Section 418-00 .
• No response/not equipped for SJB, refer to Section 419-10 .
• System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the SJB.

1. If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index.

1. If no DTCs related to the concern are retrieved, GO to Symptom Chart .
2. • The control illumination is inoperative
   • Fuse
   • Smart junction box (SJB)
   • Go To Pinpoint Test A .
   • The instrument cluster illumination is inoperative
   • Instrument cluster
   • CHECK the audio unit illumination for correct operation.
     • If the audio unit illumination operates correctly, INSTALL a new instrument cluster. REFER to Section 413-01 . TEST the system for normal operation.
     • If the audio unit illumination does not operate correctly, REFER to Section 418-00 to continue diagnosis of the communications network.
   • The audio unit illumination is inoperative
   • Audio unit
   • CHECK the instrument cluster illumination for correct operation.
     • If the instrument cluster illumination operates correctly, REMOVE the audio unit. REFER to Section 415-01 . SEND it to an authorized repair facility. TEST the system for normal operation after the repair.
     • If the instrument cluster illumination does not operate correctly, REFER to Section 418-00 to continue diagnosis of the communications network.

What lights are not working ? The instrument cluster illumination is inoperative or all the lights ,radio , heater control head, all the switches that would be back lighted.

The climate control panel illumination is inoperative , The passenger door lock control switch illumination is inoperative. Could need new dimmer switch , new instrument cluster. When installing a new instrument cluster, it is necessary to upload the module configuration to the scan tool. Following installation of the new instrument cluster, download the module configuration from the scan tool into the new instrument cluster. Refer to Section 418-01 .

hi,seem lighting switch is grounded or wiring for cluster is grounded,if can remove the lighting switch disconnected the wire,see if light in cluster is off,switch or wiring must check,ty