Do you have access to Mitchell1 Prodemand? If you are willing to share user/password (we can pay), please get in contact with us ASAP (truly, it is urgent): email operation-charm [[at]] tuta.io or click to submit anonymously
Pinpoint Test W: The Rear Fog Lamps Are On Continuously
Fog Lamps
Pinpoint Tests
Pinpoint Test W: The Rear Fog Lamps Are On Continuously
Refer to Wiring Diagram Set 86, Fog Lamps for schematic and connector information. Diagrams By Number
Normal Operation
When the headlamp switch is placed in the HEADLAMPS ON position and the knob is pulled to the second detent, the headlamp switch provides voltage to the rear fog lamps. Voltage is also routed to the Generic Electronic Module (GEM) to indicate the rear fog lamps are on (rear fog lamps on indicator).
NOTE: If the vehicle is not equipped with front fog lamps, the second detent is not available. When the fog lamp switch is pulled to the first detent, voltage is provided to the rear fog lamps.
- DTC B2509 (Rear Fog Lamp Switch Circuit Failure) - an on-demand DTC that sets when the GEM detects a short to voltage from the fog lamps voltage supply circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Headlamp switch
- GEM
PINPOINT TEST W: THE REAR FOG LAMPS ARE ON CONTINUOUSLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
-------------------------------------------------
W1 CHECK THE HEADLAMP SWITCH
- Ignition OFF.
- Disconnect: Headlamp Switch C205.
- Ignition ON.
- Do the rear fog lamps continue to illuminate?
Yes
GO to W2.
No
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
W2 CHECK THE GEM
- Ignition OFF.
- Disconnect: GEM C201b.
- Ignition ON.
- Do the rear fog lamps continue to illuminate?
Yes
REPAIR the rear fog lamps voltage supply circuit for a short to voltage. TEST the system for normal operation.
No
GO to W3.
-------------------------------------------------
W3 CHECK FOR CORRECT GEM OPERATION
- Ignition OFF.
- Disconnect all the GEM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the GEM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new GEM. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
-------------------------------------------------