All of the interior lights in my 2001 Suburban 1500 LS including dome, map, glove compartment and cargo compartment lights are out. Opening any door or using the manual switch results are the same. The 2 inrterior light fuses look good. When I push the Dome Overide switch I can hear the relay clicking. Any ideas where I shoul look next?

ARE YOU PARKED KEY OR KEY ON RUNNING.
SEE QUOTE PAGE32.
READ THE USERS GUIDE FREE IN THE GLOVE BOX
MINE 2010, DAY 1, I SET ALL LAMPS INSIDE TO DISABLED
THAT WAY NEVER COME BACK TO CAR WITH DEAD BATTERY NOW FOR 12 YEARS NOW, BY MY ACTS.
BUT MANUALS SWITCHES DO WORK.
This gets tricky with 3 switches in the car ,mine , 2 dome
and one on the head lamp lever.
even opening doors on mine, no dome lamp, by may settings, in the manual.
car run perfectly day or night ,correct?
one can say manual 2ways.]
at lever /button on dome.
or open any door is a manual act,
I disable every one allowed, by my needs. cover how in the guide
NO LED upgrades correct.?
mine the dome switches are on, off , auto, so I use off, and they never come on. ever.
on yours it is different PAGE 32 USERS GUIDE QUOTES,
"To protect the battery, the interior lights will
turn off automatically 15 minutes after the
ignition is moved to the LOCK position.
THIS SAVES BATTERY IF THEY FAIL.(MY COMMENT)
"This
will occur if the interior lights were switched
on manually or are on because a door is open.
This includes the glove compartment light
and the cargo area light.
To restore interior
light operation, either place the ignition in
the ON/RUN position or cycle the light
switch."

THIS IS A SUPER GOOD FEATURE,.
WRECKING $175 BATTERY IS NOT. CHEAP OR EVER FUN.

Check fuses under the hood on driver side

Interior lights and the power door locks are controlled by a electronic control module . Hooking up a factory or some other type professional scan tool an checking for codes an viewing input data to these control modules would be the first thing to do.
The interior lighting system consists of the following:

• lighting control module (LCM)
• driver door module (DDM)
• instrument panel
• dome/map combination
• courtesy/reading lamps
• orientation light
• door lamps
• footwell lamps
• luggage compartment lamp
• glove compartment lamp
• vanity mirrors
• door ajar switches
• viewing wiring diagrams an checking power and ground circuits for these modules would be the next step if no codes were found . Principles of Operation
  Lighting Control Module This vehicle uses a lighting control module (LCM). The LCM is a microprocessor-based module that controls several vehicle subsystems, responds to electrical input signals from various switches, sensors, and external modules and is located on the LH side of the instrument panel. LCM subsystem functions include:
  
  • headlamps with autolamps
  • turn signal lamps/hazard flasher lamps
  • cornering lamps
  • parking lamps
  • daytime running lamps
  • interior lamps
  • demand lamps
  • battery saver
  The LCM interfaces with the driver door module (DDM) via the standard corporate protocol (SCP) network for the illuminated entry feature.
  The interior lamp is illuminated by pressing the individual interior lamp switch. The interior lamp is also illuminated by door ajar switches located in the door latches, when any door is opened. A theater lighting feature gradually increases or decreases the light intensity when switched by opening or closing a door.
  The dome/map lamp combination are located on each side of the interior lamp. The map lamps are operated independently of the interior lamp by two switches located on the interior lamps.
  The interior lamps are illuminated by holding the panel dim switch in the UP position until the dome lamps turn on. The interior lamp also illuminates when a door is opened and actuates the door ajar warning lamp switch in the door latch.
  The front map lamps are powered by the demand lighting circuit and the interior lighting circuit.
  The rear passenger reading lamps are incorporated into the rear seat assist handle and are located over the rear door openings. These lamps are illuminated through power supplied by the LCM demand lighting circuit.
  Interior lamps (controlled by the LCM) are activated by using the dome lamp switch (instant ON/OFF response) or when a door is ajar. The following lamps illuminate for interior lighting:
  
  • instrument panel interior lamps
  • front map lamps
  • rear reading lamps
  • door lamps
  Demand lighting includes lamps that are illuminated by the customer by directly actuating a switch. The front dome/map lamps are located in the overhead console. Each lamp is controlled by its own switch.
  The following demand lamps are powered by the demand lighting output of the LCM:
  
  • glove compartment lamp
  • vanity mirror lamp
  • luggage compartment lamp
  Each lamp has a dedicated switch that closes to ground to illuminate the lamp.
  The front map lamps are powered by either the demand lighting circuit or the interior lighting circuit, depending upon the position of the switch associated with each lamp. When the customer turns the front map lamp switch ON, the front map lamp is illuminated through power supplied by the LCM demand lighting circuit. If the customer moves the map lamp switch to the OFF position, the power from the LCM demand lighting circuit is interrupted and the lamp is reconnected to the interior lighting circuit.
  The rear reading lamps are powered by either the interior lighting circuit or the demand lighting circuit.
  The luggage compartment lamp is controlled by the trunk ajar switch, and is powered by the demand lighting output from the LCM, and is mounted near the center of the upper rear panel.
  The glove compartment lamp system consists of a glove compartment lamp switch and wire and miniature bulb assembly. Opening the glove compartment door closes the switch which provides power to the glove compartment lamp switch and wire. The glove compartment lamp switch is grounded to the body sheet metal.
  The vanity mirror lamp system consists of a switch and bulb assembly in the RH inside visor and the LH inside visor. Lifting the vanity mirror cover closes the vanity mirror lamp switch and provides power to the lamps.
  The illuminated entry system is controlled by the LCM and provides interior lighting upon entry to the vehicle.
  Interior lamps will be illuminated for 25 (±1) seconds which includes a theater lighting ramp-up time (0.5 seconds). This time interval does not include the theater lighting ramp-down time. Interior lamps will be turned off before the 25 (±1)-second timeout if the ignition switch is turned to the RUN or ACC position.
  The illuminated entry system has the following additions to accommodate the remote entry system: pressing the unlock button on the remote transmitter will activate the illuminated entry system (with theater ramp-up). When the driver door module detects a button press, it sends a signal on the J1850 communication network activating the interior lamps. The lighting control module will turn off the lamps by sensing the all doors lock signal.
  The battery saver feature prevents excessive drain from loads inadvertently left on. When the ignition switch is turned OFF, power is interrupted to the interior lamps and headlamps (after a 10-minute timeout) and the demand lamps (after a 30-minute timeout).
  The battery saver has the following inputs:
  
  • luggage compartment door ajar switch
  • dome lamp switch
  • ignition switch status
  • illuminated entry signal
  • headlamp switch
  • driver/passenger door ajar entry switch
  • keyless entry remote transmitter
  • door unlock, luggage compartment door release

Voltage to the coil of the courtesy lamp relay, dome, reading lamp, courtesy lamps, cargo Lamp, instrument panel (IP) compartment lamp and the underhood lamp is supplied from the Inadvertent power relay on CKT 1732. The inadvertent power relay receives voltage from the CTSY LP fuse which is hot at all times. Ground for the courtesy lamps goes through the courtesy lamp relay. Both relays are controlled by the body control module (BCM) based on inputs from door jamb switch, dome lamp switch or door handle switch. The BCM will supply a ground to the courtesy lamp relay when closing any one of the above switches to ground. Ground for the reading lamp, cargo lamp, IP compartment lamp and the underhood lamp is supplied by its own ground.

Hi Rich , what lights are you talking about ? Exterior Lighting , Interior Lighting ? It doesn't matter All lights are controlled by SJB smart junction box ! An you can't just stick in a used one , It will need to be programmed ! Interior Lighting The interior lighting system consists of the following components:

• Smart junction box (SJB)
• Dimmer control switch
• Interior/map lamps
• Cargo lamp
• Glove compartment lamp
• Vanity mirror lamps
• Door ajar switches
• Puddle lamps

The interior lighting system consists of 2 subsystems:

• Courtesy lamps
• Demand lamps

The courtesy lamps are controlled by the SJB. The courtesy lamp subsystem consists of the interior dome lamps, the puddle lamps and the overhead console lamps (if equipped). The SJB supplies voltage to the courtesy lamps when the SJB receives the required input.
The demand lamps are controlled by the SJB. The demand lamps subsystem consists of the glove compartment lamp, all map/reading lamps, and the left and right vanity mirror lamps.
The SJB supplies power to the interior lighting system. The SJB will set DTCs if certain circuit failures exist with the interior lighting system.
Exterior Lighting Headlamps
The headlamp system is a dual-beam pattern system. It consists of a low and high beam, with a replaceable bulb. The headlamp assembly has the park/turn indicator lamp integrated into the headlamp assembly. The smart junction box (SJB) supplies voltage to the headlamps when demanded.
Principles of Operation
The SJB receives inputs and delivers outputs to a majority of the electronically-controlled features of the vehicle. The SJB constantly monitors the systems under its control and reports a concern in the form of a DTC. The DTC can be retrieved with a scan tool through the medium speed controller area network (CAN) communication network.
NOTE: Prior to the removal of the SJB, it is necessary to upload the module configuration information to the diagnostic tool. This information must be downloaded to the new SJB after installation. For additional information, refer to Section 418-01 .

Check the dome light switch. I believe its between the map lights in the front overhead console. You can set it to Always Off, On with Doors, or Always On.

The Dome light and the cargo area light should come on when the door is open and the switch is set to door position, or when set to the always on position.

If only one of the lights come on change the bulb of that light. If neither light comes on change the fuse.

I believe the instrument panel fuse block is located on the passenger side of the center console, to the left of the glove box near the floor. The cover usual lists where and what each fuse does. Look for Interior Lighting, I believe #23. Pull the fuse and check if its broken. If it is replace it. If not you may have electrical issues.

Interior lights blink off and on ????? As in dome lamps, dash light's etc...??? An what the heck is this mean We were told to hinge the module?????? I have been an automotive technician over 30 yr's an never heard the term hinge the module. The interior lighting on your vehicle is controlled by the smart junction box , ford's BCM body control module . ( Electronic's ) Who checked the vehicle ? Dealer ?
Interior Lighting The interior lighting system consists of the following:

• Smart junction box (SJB)
• Interior/map lamp assembly
• Rail lamps (if equipped)
• Glove compartment lamp assembly
• Dimmer switch
• Illuminated vanity mirrors (if equipped)
• Rear cargo lamp
• Puddle lamps (if equipped)
• Door ajar switches
• Liftgate glass ajar switch

The interior lighting system consists of 2 subsystems:

• Courtesy lamps
• Demand lamps

The courtesy lamps are controlled by the SJB. The courtesy lamp subsystem consists of the ajar switches, the interior dome lamps, the puddle lamps, the roof rail lamps, the cargo lamp, and the overhead console lamps (if equipped). The SJB supplies voltage to the courtesy lamps when the SJB receives the required input.
The demand lamps subsystem consists of the glove compartment lamp, the dimmer switch, the cargo lamp, all map/reading lamps, the roof rail lamps, and the LH and RH vanity mirror lamps.
The SJB supplies power to the interior lighting system. The SJB sets DTCs if certain circuit failures exist with the interior lighting system.
Visual Inspection Chart Mechanical Electrical

• Courtesy lamps
• Map lamps
• Vanity lamps
• Door ajar switches

• Smart junction box (SJB) fuse(s):
  • 9 (15A)
  • 10 (15A)
  • 25 (10A)
• Circuitry
• Courtesy lamps
• Map lamps
• Cargo lamps
• Vanity lamps
• Glove compartment lamp
• Dimmer switch
• SJB

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. NOTE: Make sure to use the latest scan tool release software. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).

1. NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM. If the scan tool does not communicate with the VCM:
   • Check the VCM connection to the vehicle.
   • Check the scan tool connection to the VCM.
   • Refer to Section 418-00 , No Power To The Scan Tool, to diagnose no communication with the scan tool.

1. If the scan tool does not communicate with the vehicle:
   • Verify the ignition key is in the ON position.
   • Verify the scan tool operation with a known good vehicle.
   • Refer to Section 418-00 to diagnose no response from the powertrain control module (PCM).

1. Carry out the network test.
   • If the scan tool responds with no communication for one or more modules, refer to Section 418-00 .
   • If the network test passes, retrieve and record the continuous memory DTCs.

1. Clear 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) Chart or the Power Liftgate Module Diagnostic Trouble Code (DTC) Chart. For all other DTCs, refer to Section 419-10 .

1. If no DTCs related to the concern are retrieved, GO to Symptom Chart .

Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Chart DTC Description Action B1320 Driver Door Ajar Circuit Open Go To Pinpoint Test C . B1328 Passenger Door Ajar Circuit Open Go To Pinpoint Test C . B1331 Decklid Ajar Rear Door Circuit Failure Go To Pinpoint Test C . B1336 Door Ajar RR Circuit Open Go To Pinpoint Test C . B1572 Door Ajar LR Circuit Go To Pinpoint Test C . B1688 Lamp Dome Input Circuit Short to Ground Go To Pinpoint Test C . B2077 Liftgate Ajar Circuit Failure Go To Pinpoint Test C . B2A35 Interior Lighting Output Circuit Open If the courtesy lamps are inoperative, Go To Pinpoint Test A .
If the courtesy lamps stay on continuously, Go To Pinpoint Test C . B2A36 Interior Lighting Output Circuit Short to Ground Go To Pinpoint Test A . B2A39 Puddle Lamp Output Circuit Open Go To Pinpoint Test J . B2A3A Puddle Lamp Output Circuit Short to Ground If the puddle lamps are inoperative, Go To Pinpoint Test J .
If the puddle lamps are always on, Go To Pinpoint Test L . All other DTCs - REFER to Section 419-10 .

hAVE YOU CHECKED THE FUSE FOR THE INTEROR LIGHTS?

The SJB supplies power to the interior lighting system. The SJB will set DTCs if certain circuit failures exist with the interior lighting system.
Visual Inspection Chart Mechanical Electrical

• Courtesy lamps
• Map lamps
• Luggage compartment lamp
• Vanity lamps
• Glove compartment lamp

• Smart junction box (SJB) fuse 3 (15A)
• Circuitry
• Courtesy lamps
• Map lamps
• Luggage compartment lamp
• Vanity lamps
• Glove compartment lamp
• SJB

Check fuse # 3 SJB

Check under the hood, in the fusebox, for a fuse label ctsy (courtesy). It'll be over the driver side wheel. Replace it, if blows and, you have a wire touching bear metal somewhere. Good luck!