Symptom:
*BACKUP LAMPS COME ON WHILE SHIFTER IS NOT IN REVERSE
POSITION
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
BACKUP SUPPLY CIRCUIT SHORT TO VOLTAGE
TRANSMISSION RANGE SENSOR
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 at
the wrong time.
Do the Backup Lamps come on while the shifter is not in Reverse?
All
Yes → Go To 2
No → Go To 5
2 Ignition on, engine not running.
Place the shift lever in a position that causes the Backup Lamps to come on when
they should not.
Disconnect the TRS harness connector.
NOTE: This will cause a DTC P0706 and possibly other DTC’s to be stored in
the PCM. 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 → Go To 3
No → Go To 4
3 If there are no possible causes remaining, view repair. All
Repair
Replace Transmission Range Sensor per the Service Information.
4 Turn the ignition off to the lock position.
Disconnect the TRS harness connector.
Ignition on, engine not running.
Measure the voltage of the Backup Light Supply circuit in the TRS harness
connector.
Is the voltage above 0.5 volt?
All
Yes → Repair the Backup Lights Supply circuit for a short to voltage.
No → Test Complete.
5 The conditions necessary to set this DTC are not present at this time. Using the
schematics as a guide, inspect the wiring and connectors specific to this circuit.
Wiggle the wires while checking for shorts and open circuits.
Were there any problems found?
All
Yes → Repair as necessary.
No → Test Complete.
168
TRANSMISSION - NGC
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