Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

FOG LAMPS WILL NOT TURN ON - DIAGNOSTIC PROCEDURE

TEST	ACTION
1	Disconnect the CTM C3 harness connector. Measure the resistance of the Fog Lamp Relay Control circuit. Is the resistance below 5.0 ohms? Yes --> Go To 2 No --> Repair the Fog Lamp Relay Control circuit for an open condition. Perform BODY VERIFICATION TEST - VER 1 .
2	Remove the Fog Lamp Relay from the PDC. Measure the voltage of the Fused B+ Circuit to ground. Is the voltage above 10.0 volts? Yes --> Go To 3 No --> Repair the Fused B+ circuit for an open condition. Perform BODY VERIFICATION TEST - VER 1 .
3	Remove and inspect the inoperative bulbs. Are the inspected bulbs OK? Yes --> Go To 4 No --> Replace the inoperative bulbs. Perform BODY VERIFICATION TEST - VER 1 .
4	Disconnect the Headlamp Switch harness connector. Using a jumper check the Fog Lamp Switch Sense circuit to ground. Did the Fog Lamps come on? Yes --> Repair the Fog Lamp Switch Sense circuit for an open condition. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 5
5	Check Fuse H in the PDC. Is the Fuse open? Yes --> Replace the open fuse. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 6
6	Remove the Fog Lamp Relay from the PDC. Measure the resistance of the Fog Lamp Relay Output Circuit in the relay connector. Is the resistance below 0.5 ohms? Yes --> Repair the Open Fused B+ Circuit. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 7
7	Remove the Fog Lamp Relay from the PDC. Connect a 12 volt test light between the Fog Lamp Relay Control Circuit and the Fused B+ Circuit. Actuate the Fog Lamp Relay. Did the test light flash during actuation? Yes --> Replace the Fog Lamp Relay. Perform BODY VERIFICATION TEST - VER 1 . No --> Replace the Central Timer Module. Perform BODY VERIFICATION TEST - VER 1 .