Symptom:
*BACKUP LAMPS INOPERATIVE
POSSIBLE CAUSES
OPEN BACKUP LAMP BULB(S)
BACKUP LAMP GROUND CIRCUIT OPEN
BACKUP LAMP SUPPLY CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
TRANSMISSION RANGE SENSOR
INTERMITTENT BACKUP LAMPS
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 back-up lamps work?
All
Yes → Go To 2
No → Go To 3
2 If one backup lamp works, the problem must be in the bulb or the wiring to the one
that doesn’t work. Check the bulb, Backup Lamp Supply circuit and the Ground
circuit to the one that does not work.
Using the schematics as a guide, inspect the wiring and connectors specific to this
circuit. Wiggle the wires while checking for shorted and open circuits.
View repair options.
All
Repair
Repair as necessary.
3 Turn the ignition off to the lock position.
Remove the Starter Relay.
CAUTION: Removal of the Starter Relay is to prevent a Transmission, NO
RESPONSE, condition and disable the starter.
Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmis-
sion Adapter kit 8333-1A.
Ignition on, engine not running.
Press the 9Reverse LightTest9 button on theTransmission Simulatorwhile observing
the Back-up Lamps.
Do either of the Back-up Lamps come on?
All
Yes → Replace the Transmission Range Sensor per the Service Informa-
tion.
No → Go To 4
4 Remove both Backup Lamp bulbs.
NOTE: Check the Backup Lamp Sockets and Clean/repair as necessary.
Measure the resistance of the Backup Lamp bulbs.
Is the resistance above 5.0 ohms on either bulb?
All
Yes → Replace the Backup Lamp bulb(s). Verify the bulbs illuminate
with the Transmission Simulator.
No → Go To 5
169
TRANSMISSION - NGC
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