Diagnostic Routine D
Diagnostic Routine D
Diagnostic Overview
The Low Beams Are On Continuously
Refer to Wiring Diagram Set 85 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
REFER to Low Beams .
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- Inspect the BJB (Battery Junction Box) fuse 23 (5A).
- Inspect the headlamp switch for damage.
Pinpoint Test
1. CHECK FOR BCM (Body Control Module) DTCs (Diagnostic Trouble Codes)
1. Ignition ON.
2. Using a scan tool, perform the BCM (Body Control Module) self-test.
Is DTC (Diagnostic Trouble Code) B1087:86, B1087:88, B1130:07, B1130:83, B1130:87, B1A85:21, B1A85:22 or B1A85:2F present?
2. CHECK WINDSHIELD WIPER OPERATION
1. Observe the windshield wipers.
Are the windshield wipers on?
3. CHECK THE HEADLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect: Headlamp Switch.
3. Measure:
Is the voltage greater than 11 volts?
4. CHECK THE HEADLAMP SWITCH GROUND CIRCUIT FOR AN OPEN
1. Measure:
Is the voltage greater than 11 volts?
5. CHECK THE LIN (Local Interconnect Network) CIRCUIT TO THE HEADLAMP SWITCH FOR AN OPEN
1. Disconnect: BCM (Body Control Module) C2280C.
2. Measure:
Is the resistance less than 3 ohms?
6. ISOLATE THE SASM (Steering Angle Sensor Module)
1. Ignition OFF.
2. Disconnect: SASM (Steering Angle Sensor Module) C226A.
3. Ignition ON.
Do the low beams continue to illuminate?
7. ISOLATE THE HEADLAMP SWITCH
1. Ignition OFF.
2. Connect: SASM (Steering Angle Sensor Module) C226A.
3. Disconnect: Headlamp Switch.
4. Ignition ON.
Do the windshield wipers continue to operate?
8. CHECK THE LIN (Local Interconnect Network) CIRCUIT TO THE SASM (Steering Angle Sensor Module) FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: BCM (Body Control Module) C2280C.
3. Disconnect: SASM (Steering Angle Sensor Module) C226A.
4. Disconnect: Ignition Relay.
5. Connect a fused jumper wire:
6. Measure:
Is any voltage present?
9. CHECK THE LIN (Local Interconnect Network) CIRCUIT TO THE HEADLAMP SWITCH FOR A SHORT TO VOLTAGE
1. Measure:
Is any voltage present?
10. CHECK THE LIN (Local Interconnect Network) CIRCUIT TO THE SASM (Steering Angle Sensor Module) FOR A SHORT TO GROUND
1. Measure:
Is the resistance greater than 10,000 ohms?
11. CHECK THE LIN (Local Interconnect Network) CIRCUIT TO THE HEADLAMP SWITCH FOR A SHORT TO GROUND
1. Measure:
Is the resistance greater than 10,000 ohms?
12. CHECK THE LOW BEAM VOLTAGE SUPPLY CIRCUITS FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: BCM (Body Control Module) C2280D.
3. Ignition ON.
Do the low beams continue to illuminate?
13. CHECK FOR CORRECT SASM (Steering Angle Sensor Module) OPERATION
1. Disconnect and inspect all SASM (Steering Angle Sensor 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 SASM (Steering Angle Sensor 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?
14. 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?
