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) INTERMITTENT CONDITION
Turn the ignition on.

With the Scan Tool, clear all CCN DTC's.

Turn the Headlamps on.

With the Scan Tool, read the DTC information.

Does the Scan Tool read: B1608-HEADLAMP SWITCH INPUT CIRCUIT HIGH?

Yes
1. Go To step 2).
No
1. The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
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 7. Move the switch position from OFF to AUTO while measuring.

OFF = 1047 ohms

PARK LAMP = 383 ohms

HEADLAMP = 195 ohms

AUTO = 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 .