Diagnostic Routine E

Diagnostic Routine E

Diagnostic Overview

The High Beams Are On Continuously

Refer to Wiring Diagram Set 85 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

REFER to High Beams .

REFER to Headlamp Assembly .

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- Inspect the headlamp assembly for damage.

Pinpoint Test

1. CHECK THE MULTIFUNCTION SWITCH INPUT

1. Ignition ON.

2. Using a scan tool, view SCCM (Steering Column Control Module) PIDs (Parameter Identifications).

3. Using a scan tool, monitor the SCCM (Steering Column Control Module) HEADLAMP_SW PID (Parameter Identification) while placing the multifunction switch in the flash-to-pass and high beam positions.

Do the PID (Parameter Identification) values agree with the multifunction switch position?








2. CHECK THE BCM (Body Control Module) HIGH BEAM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

1. Ignition OFF.

2. Disconnect: Illuminated Headlamp.

3. Ignition ON.

4. Measure:





Is any voltage present?








3. CHECK THE BCM (Body Control Module) HIGH BEAM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

1. Ignition OFF.

2. Disconnect: BCM (Body Control Module) C2280E.

3. Ignition ON.

4. Measure:





Is any voltage present?








4. CHECK FOR CORRECT BCM (Body Control Module) OPERATION

1. Disconnect and inspect all BCM (Body Control Module) connectors.

2. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

3. Reconnect the BCM (Body Control Module) connectors. Make sure they seat and latch correctly.

4. Operate the system and determine if the concern is still present.

Is the concern still present?