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TRANSMISSION - NGC
Symptom:
*BACKUP LAMPS INOPERATIVE
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
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?
Yes → Go To 2
→ Go To 3
No
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.
Repair
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 Reverse Light Test button on the Transmission Simulator while observing
the Back-up Lamps.
Do either of the Back-up Lamps come on?
Yes → Replace the Transmission Range Sensor per the Service Informa-
→ Go To 4
No
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?
Yes → Replace the Backup Lamp bulb(s). Verify the bulbs illuminate
→ Go To 5
No
POSSIBLE CAUSES
ACTION
Repair as necessary.
tion.
with the Transmission Simulator.
306
APPLICABILITY
All
All
All
All
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