Diagnostic Test

Turn the ignition on.

With the scan tool, clear all SCM DTC's.

Turn the Panel Illumination ON then OFF.

With the scan tool, read the SCM DTC's.

Does the scan tool display: B160B-PANEL DIMMER INPUT CIRCUIT HIGH? 

Yes 

1. Go to  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 .

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 10 and 11. Move the switch position from DOME DEFEAT to DOME LAMPS while measuring.

DOME DEFEAT = 0 ohms

DIM 1 = 118 ohms

DIM 2 = 224 ohms

DIM 3 = 450 ohms

DIM 4 = 1099 ohms

DIM 5 = 1099 ohms

DIM 6 = 1099 ohms

PARADE = 1099 ohms

DOME LAMPS = 1099 ohms

Is the resistance in each position correct? 

Yes 

1. Go to  3).

No 

1. Replace the Multifunction Switch in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST .

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 9 and 11. Move the switch position from DOME DEFEAT to DOME LAMPS while measuring.

DOME DEFEAT = 1099 ohms

DIM 1 = 1099 ohms

DIM 2 = 1099 ohms

DIM 3 = 1099 ohms

DIM 4 = 1099 ohms

DIM 5 = 450 ohms

DIM 6 = 224 ohms

PARADE = 118 ohms

DOME LAMPS = 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 .

No 

1. Replace the Multifunction Switch in accordance with the service information.
2. Perform BODY VERIFICATION TEST .