Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) TEST FOR INTERMITTENT CONDITION
With the scan tool, record and erase DTC's

Operate the Fog Lamp Switch several times.

Turn the ignition on and wait 30 seconds.

With the scan tool, read DTC's.

Does the scan tool display: B168F-FRONT FOG LAMP SWITCH STUCK?

Yes
1. Go To step 2).
No
1. The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. Perform BODY VERIFICATION TEST - VER 1 .
2) LIGHTING MULTIFUNCTION SWITCH
Turn the ignition off.

Using the correct service procedure, remove the Lighting Multi-Function Switch.

Measure the internal resistance of the Multifunction Switch between cavities 4 and 5. Move the switch position from OFF to AUTO WITH FOG while measuring.

OFF = OPEN

OFF WITH FOG = 1047 ohms

PARK WITH FOG = 383 ohms

HEAD WITH FOG = 173 ohms

AUTO WITH FOG = 0 ohms

Is the resistance in each position correct?

Yes
1. Replace the Steering Control Module in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Multifunction Switch in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .