Hi there can you tell me if the rear led lamps for the infinity fx 35 have a feed back circuit for the brake light and indicator circuits as i work for a import company in the uk and i need to to know weather i can split the brake light and indicator circuit to comply with european sva standards. many thanks

Any ideas on what else to check?
Yeah, hook up a professional grade scan tool an check for DTC'S -diagnostic trouble codes in the BCM - body control module. Seeing how it controls (turns on) these lights. Turn/hazard indicators flashing fast means a bad bulb or short circuit somewhere.

DTC B3949: Right Front Turn Signal Circuit
Circuit/System Description
Ground is applied at all times at G200 to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to the front and rear turn signal lamps through their respective control circuits. When a turn signal request is received by the BCM, a serial data message is sent to the instrument panel cluster (IPC) requesting the respective turn signal indicator be pulsed ON and OFF.

DTC B3951: Right Rear Turn Signal Circuit
DTC B3951 will set when the BCM detects a short to ground or an open/high resistance in the RR turn signal control circuit.

DTC B3950: Left Rear Turn Signal Circuit

DTC B3948: Left Front Turn Signal Circuit

DTC B3445: Stop Lamp Circuit

when you said neither works are you saying they do not light up at all? is it both sides or just one if you tell us this we can and will help you. Thanks Mike L.

Stop Lamps
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake is applied, the BCM will then apply battery voltage to the left and right stop/turn signal lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM applies battery voltage through the signal circuit to the transmission control module (TCM) and the engine control module (ECM) indicating that the brakes are applied.
Ground for the stop lamps is supplied as follows:
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps
• G301 provides ground for the CHMSL
The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.
Battery voltage from the LT TRN/SIG and RT TRN/SIG fuses located in the rear fuse block is also used by the body control module (BCM) for stop lamp operation.

Turn Signal Lamps
Battery voltage supplied to the body control module (BCM) from the fuses listed below is used for turn signal and hazard lamp operation.
• LT TRN/SIG fuse for the left turn signals
• CTSY/RF TRN fuse for the right front turn signal
• RR TRN/SIG fuse for the right rear turn signal
When the turn signal switch is place in either the LEFT or RIGHT position, ground from G300 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. At the same time the BCM sends a GMLAN serial data message to the instrument panel cluster (IPC) to cycle the appropriate turn signal indicator ON and OFF.
Ground for the turn signal lamps is supplied as follows:
• G104 provides ground for the left and right front turn signal lamps
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps

Do you have a factory scan tool (tech2) ? Your best bet , take it to the dealer .

The traction control system is part of ABS control module an if the light is on there is A DTC - diagnostic trouble code stored in the EBCM - electronic brake control module ! The brake pedal position sensor is an input to the EBCM , when you press the brake pedal the EBCM then energizes the BAS relay in the left rear fuse box turning on the brake lamps !
There could be a DTC like
DTC B3903
The electronic brake control module (EBCM) supplies voltage to the BAS relay coil side voltage supply circuit when the stop lamps are active. The coil side control circuit of the BASS relay is permanently grounded at G402.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B3903 Stop Lamp Relay Circuit
Or
DTC C0278
The brake pedal position sensor (BPP) is a potentiometer. The electronic brake control module (EBCM) supplies a 5-volt reference circuit and low reference circuit to the BPP sensor. The BPP sensor signal circuit is a direct input to the EBCM. The EBCM determines the BPP based on the voltage from the BPP sensor. The EBCM converts the BPP sensor feed back voltage to a digital signal and puts it on the class 2 communication bus.
DTC C0282 Brake Pedal Position Sensor Circuit Range/Performance
DTC C0283 Brake Pedal Position Sensor Circuit Low
DTC C0284 Brake Pedal Position Sensor Circuit High
DTC C0880 Device Voltage Reference Output 2 Circuit
You may want to take this to the dealer !

dash lights are Park dimmer, adjust the dimmer it might have dead spots in the control try that.
the fuse blow is easy.
1: the brake light feed line is shorted. the fuse saved the fire.

there are only 2 ways (i have 4-5) to fix shorts.
1: look, inspect the the whole brake feed path (stop lights)
collision damage, pack rats eat it (we have em) or uhaul dudes hacked up your wiring for trailer usage/??? hitch /lights from H3LL>

2: did you know the old style stop lamps can short( brass shell)
replace them for $3
3: i use 2 ways to find this , and ohm meter on the circuit
with no lamps in socket, 0 ohms or near shorted, infinity good.
or i use my fancy current limited power supply and back feed
the lamp circuit , fuse pulled.
my power supply shows (set to 5amps) shows 5amps.
its short, with one eye on that dial
i pull all connectors on the brake feed line

bam this connector cut current to zero so the short of to rear.
i pull more, conns. bam, again. the soort is near left rear tail ight
omg, look here wire damage, howd i miss that/?
or trailer hacks right there....
there is another way.
some shops have a fuse Circuit breaker tool $5
it modifies a stock fuse for a CB. at 5amps
so same deal pull connectors to find short.
there is a 5 th way but the tools is very expensive called a TDR
its a short radar, that tells you how many inches away is the short.
(we had them in the military, i loved mine, true love )
it measure the speed of light (near). (joking,) but 1/2true.

I help my wife remover her shorts all the time.. Grin.

first remove the wire you hook up rear tail and break circuit. (1)install ground wire to the frame (2)turn on the head light switch and go to the rear to find the +12 volt on the wire then hook it up to the led tail circuit, it should only light up that circuit but if both still come on then the new led unit is not config right. Replace it or have it modified. if only the tail circuit is on then go to (3)cut off the head light switch and have someone step on the break peddle then fine the +12 volt on the wire and hook it up to the brake led circuit.(only the brake circuit should be on) hope this help you. .

Nice SUV, I have the same with 5.2L V8 Limited!!!

Are you sure that there are no lights out?pay attention to the third brake light because it has 3 bulbs and if one is outit will give you that message.also make sure that all of the bulbs are the right ones.

I used to get the "Rear Lamp Failure" message on my '93 Limited after the lights were on for a few minutes... it went away when I changed the rear bulbs to the same brand. The Lamp Outage Module (located in the LR quarter panel, near the fuel filler) is looking for differences in current flow between the left and right side bulbs.

You probably need a new lamp outage module...
CIRCUIT OPERATION
The Lamp Outage Module (LOM) determines if a rear lighting lamp is not operating. When the ignition switch is in the START or RUN position, circuit A1 from fuse 8 in the Power Distribution Center (PDC) connects to circuit A21. Circuit A21 feeds circuit F87 through fuse 5 in the junction block. Circuits F87 feeds the LOM.
- Circuit G46 from the LOM connects to the Vehicle Information Center (VIC) . When the LOM senses a inoperative lamp, the VIC displays the data to the vehicle operator.
- Circuit L90 which feeds the tail lamps and side marker lamps, connects to the LOM. From the LOM, circuit L90 continues to the license plate lamps. Circuits L21 and L22 from the LOM power the tail lamps and side marker lamps.
- Circuit L50 from the stop lamp switch connects to the LOM. From the LOM, circuits L73 and L74 power the stop lamps and circuit L87 powers the Center High Mounted Stop Lamps (CHMSL) . Circuit Z1 grounds the LOM.

If you need tha owners and repair manual about your ZJ Grand Cherokee, just keep in touch and send me one comment.

Hope this helps (remember to rate this answer).

The high mount brake light has its own fuse, so check that first. The high mount bulb is generally a stabdard type (there may be more than one bulb) or you can replace with an LED. As for the left rear bulbs not working when depressing brake pedal, check the bulbs again for any spring that may be broken. If the bulbs are still good, make sure there is sufficient contact with the socket. If still not working, have someone check it out further.

Pin
Wire Color
Circuit No.
Function
A
BRN
9
Parklamp Feed
B
LT GRN
24
Backup Lamp Feed
C
BLK
750
Ground
Pin
Wire Color
Circuit No.
Function
A
BRN
9
Parklamp Feed
B
LT GRN
24
Backup Lamp Feed
C
BLK
750
Ground
Pin
Wire Color
Circuit No.
Function
A
BRN
9
Parklamp Feed
B
LT GRN
24
Backup Lamp Feed
C
BLK
750
Ground
Find 3 wire connector going to lense in trunk Pin
Wire Color
Circuit No.
Function
A
BRN
9
Parklamp Feed
B
LT GRN
24
Backup Lamp Feed
C
BLK
750
Ground
Pin
Wire Color
Circuit No.
Function
A
BRN
9
Parklamp Feed
B
LT GRN
24
Backup Lamp Feed
C
BLK
750
Ground
brown wire light green wire & black blk is grd moke sure its good, lit grn back up lights,drk Pin
Wire Color
Circuit No.
Function
A
BRN
9
Parklamp Feed
B
LT GRN
24
Backup Lamp Feed
C
BLK
750
Ground
brn tail lights turn parking lights on & with a test light back probe connector no power to brown? ck fuse trace harness to switch wires all good bad switch if you know how to use ohm meter you could use that to ck for shorts on continuity Pin
Wire Color
Circuit No.
Function
A
BRN
9
Parklamp Feed
B
LT GRN
24
Backup Lamp Feed
C
BLK
750
Ground

You either have a 'single filament' bulb installed in a 'dual filament' brake lamp socket ... OR .. you have a 'dual filament' bulb short circuited internally. Check your rear brake lamp bulbs (supposed to be 'dual filament' - two contacts on their bottoms). When you step on the brake pedal, do your dash lights LIGHT UP? A 'cross circuit' exists between brake lamp circuit and parking lamps circuit.