B1788

B1788-HEADLAMP LEVELING MOTOR CONTROL CIRCUIT LOW







- When Monitored:
With the Headlamps activated.

- Set Condition:
When the Headlamp Leveling Module (HIDT) detects an shorted low condition.





1. INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all DTC's.
3. Turn the Headlamps on.
4. With the scan tool read DTC's.

Does the scan tool display: B1788-HEADLAMP LEVELING MOTOR CONTROL CIRCUIT LOW?

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. (L13) HEADLAMP ADJUST SWITCH CIRCUIT OPEN





NOTE: Check all fuses and circuit breakers before proceeding with the diagnosis of this DTC.

1. Turn the ignition off.
2. Disconnect the TIPM C4 Connector.
3. Turn the ignition on.
4. Measure the voltage on the (L13) Headlamp Adjust Switch circuit at the TIPM.

Is the voltage above 10.0 volts?

Yes

- Go To 3

No

- Repair the (L13) Headlamp Adjust Switch circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test

3. RIGHT FRONT LAMP ASSEMBLY/LEFT FRONT LAMP ASSEMBLY
1. Turn the ignition off.
2. Disconnect the Right Front Lamp assembly, follow test, then check the Left Front Lamp assembly.
3. Turn the ignition on.
4. With the Scan Tool, clear all DTC's.
5. Activate the Headlamps.
6. With the Scan Tool, read the DTC's.

Does the scan tool display this DTC as active?

Yes

- Go To 4

No

- Replace the applicable headlamp assembly.
- Perform the BODY VERIFICATION TEST. Body Verification Test

4. (L13) HEADLAMP ADJUST SWITCH CIRCUIT SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the TIPM C4 Connector.
3. Measure the resistance to ground of the (L13) Headlamp Adjust Switch circuit.

Is the resistance below 5.0 ohms?

Yes

- Repair the (L13) Headlamp Adjust Switch circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test

No

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