B1789

B1789-HEADLAMP LEVELING MOTOR CONTROL CIRCUIT HIGH







- When Monitored:
Continuously.

- Set Condition:
When the Totally Integrated Power Module (TIPM) detects a high condition.





1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all DTCs
3. Turn the Headlamps on.
4. With the scan tool, read DTCs.

Does the scan tool display active: B1789-HEADLAMP LEVELING MOTOR CONTROL CIRCUIT HIGH?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. (L133) HEADLAMP LEVELING MOTOR CONTROL CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the TIPM C7 harness connector.
3. Disconnect the Headlamp assembly harness connector.
4. Measure the resistance of the (L133) Headlamp Leveling Motor Control circuit between the Headlamp assembly harness connector and the TIPM C7 harness connector.

Does the Ohm meter read open circuit?

Yes

- Repair the (L133) Headlamp Leveling Motor Control circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. (L133) HEADLAMP LEVELING MOTOR CONTROL CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition on.
2. Measure for voltage on the (L133) Headlamp Leveling Motor Control circuit.

Is there any voltage present?

Yes

- Repair the (L133) Headlamp Leveling Motor Control circuit short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Totally Integrated Power Module (TIPM).
- Perform the BODY VERIFICATION TEST. Body Verification Test.