Symptom:
REAR FOG INDICATOR OUTPUT OPEN
POSSIBLE CAUSES
INTERMITTENT WIRING AND CONNECTORS
REAR FOG LAMP INDICATOR CIRCUIT OPEN
REAR FOG LAMP INDICATOR GROUND CIRCUIT OPEN
REAR FOG LAMP INDICATOR CIRCUIT SHORT TO VOLTAGE
HEADLAMP SWITCH
BODY CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, record and erase Body Control Module DTC’s.
Turn the ignition off, wait 15 seconds, then turn the ignition on.
Turn on the Rear Fog Lamps.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display REAR FOG LAMP INDICATOR OPEN?
All
Yes
→ Go To 2
No
→ Go To 8
2
Turn the ignition off to the lock position.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
Turn ON the Rear Fog Lamps.
Using a 12-volt test light connected to ground, back probe the Rear Fog Lamp
Indicator circuit in the Headlamp Switch harness connector.
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 3
No
→ Go To 6
3
Turn the ignition off to the lock position.
Disconnect the Body Control Module harness connector.
Disconnect the Headlamp Switch harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the Rear Fog Lamp Indicator Ground circuit from the Body
Control Module harness connector to the Headlamp Switch harness connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the Rear Fog Lamp Indicator Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
651
INSTRUMENT CLUSTER