Jeep Wrangler TJ. Manual — part 175
Symptom:
*BACKUP LAMPS COME ON WHILE SHIFTER IS NOT IN REVERSE
POSITION
POSSIBLE CAUSES
BACKUP LAMPS ALWAYS ON
BACKUP LAMP SUPPLY CIRCUIT SHORT TO VOLTAGE
INTERMITTENT WIRING AND CONNECTORS
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
Firmly apply brakes.
Place the shift lever in the position which causes the Backup Lamps to come on other
than Reverse.
Do the Backup Lamps come on with the shift lever not in the Reverse position?
All
Yes
→ Go To 2
No
→ Go To 4
2
Ignition on, engine not running.
Place the Shift Lever in the position that causes the Backup Lamps to come on other
than Reverse.
Disconnect the TRS harness connector.
NOTE: This will cause a DTC P0706 and possibly other DTC’s to be stored in
the TCM. They must be erased before returning the vehicle to the customer.
Did the Backup Lamps go out when the TRS harness connector was disconnected?
All
Yes
→ Replace the Transmission Range Sensor per the Service Informa-
tion.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
No
→ Go To 3
3
Turn the ignition off to the lock position.
Disconnect the Transmission TRS harness connector.
NOTE: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Measure the voltage of the Back-up Lamp Supply circuit in the TCM harness
connector.
Is the voltage above 0.5 volt?
All
Yes
→ Repair the Backup Lamp Supply circuit for a short to voltage.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
No
→ Test Complete.
425
TRANSMISSION - 42RLE
TEST
ACTION
APPLICABILITY
4
The condition is not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?
All
Yes
→ Repair as necessary.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
No
→ Test Complete.
426
TRANSMISSION - 42RLE
*BACKUP LAMPS COME ON WHILE SHIFTER IS NOT IN REVERSE
POSITION —
Continued
Symptom:
*BACKUP LAMPS INOPERATIVE
POSSIBLE CAUSES
OPEN LEFT BACKUP LAMP BULB
OPEN RIGHT BACKUP LAMP BULB
BACKUP LAMP GROUND CIRCUIT OPEN
BACKUP LAMP SUPPLY CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
BACKUP LAMP SUPPLY CIRCUIT SHORT TO GROUND
TRANSMISSION RANGE SENSOR
INTERMITTENT WIRING AND CONNECTORS
TEST
ACTION
APPLICABILITY
1
Ignition on, engine not running.
Place foot firmly on brake pedal.
Place the shift lever in the reverse position.
Do either of the Backup Lamps work?
All
Yes
→ Go To 2
No
→ Go To 3
2
The condition is not present at this time.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit.
Wiggle the wiring while checking for shorts and open circuits.
Were there any problems found?
All
Yes
→ Repair as necessary.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
No
→ Test Complete.
3
Remove the left Backup Lamp bulb.
Measure the resistance of the Backup Lamp bulb.
Is the resistance above 5.0 ohms?
All
Yes
→ Replace the Backup Lamp bulb.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
No
→ Go To 4
4
Remove the right Backup Lamp bulb.
Measure the resistance of the Backup Lamp bulb.
Is the resistance above 5.0 ohms?
All
Yes
→ Replace the Backup Lamp bulb.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
No
→ Go To 5
427
TRANSMISSION - 42RLE
TEST
ACTION
APPLICABILITY
5
Turn the ignition off to the lock position.
CAUTION: Remove the Starter Relay. This will prevent the vehicle from
being started in gear.
Install the Transmission Simulator, Miller tool #8333 and the FWD Adapter Cable
kit, Miller tool #8333-1A.
Ignition on, engine not running.
Press the
9Reverse Light Test9 button on the Transmission Simulator while observing
the backup lamps.
Do either of the back-up lamps come on?
All
Yes
→ Go To 6
No
→ Go To 7
6
If there are no possible causes remaining, view repair.
All
Repair
Replace Transmission Range Sensor per the Service Information.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
7
Remove the Backup Lamp bulb.
Using a 12-volt test light connected to 12-volts, check the Backup Lamp Ground
circuit in the Backup Lamp socket.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?
All
Yes
→ Go To 8
No
→ Repair the Backup Lamp Ground circuit for an open or high
resistance.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
8
Turn the ignition off to the lock position.
Remove the Backup Lamp bulb.
Disconnect the Transmission TRS harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Backup Lamp Supply circuit from the Backup Lamp
Socket to the TRS harness connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Backup Lamp Supply circuit for an open.
Perform TRANSMISSION NO TROUBLE CODE VERIFICA-
TION TEST.
No
→ Go To 9
428
TRANSMISSION - 42RLE
*BACKUP LAMPS INOPERATIVE —
Continued
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