Automatic Headlamp Leveling Module (Ahlm) - Electrical Diagnostics: Other Dodge Durango III

WHEN MONITORED

Continuously with the ignition on.

SET CONDITION

The Automatic Headlamp Leveling Module (AHLM) detects the Headlamp Leveling Sensor Front Signal circuit is out of range.

POSSIBLE CAUSES

Scheme 2

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Scheme 9

Scheme 10

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
2. (L962) HEADLAMP LEVELING SENSOR RETURN CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Front Headlamp Level Sensor harness connector. Disconnect the Right Front Headlamp Assembly C2 harness connector. Turn the ignition on. Measure the voltage of the (L962) Headlamp Leveling Sensor Return circuit. Is any there voltage present? Yes Repair the (L962) Headlamp Leveling Sensor Return circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 3 .
3. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Measure the voltage of the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Is any there voltage present? Yes Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 4 .
4. (L960) HEADLAMP LEVELING SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE Measure the voltage of the (L960) Headlamp Leveling Sensor Signal circuit. Is any there voltage present? Yes Repair the (L960) Headlamp Leveling Sensor Signal circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 5 .
5. (L962) HEADLAMP LEVELING SENSOR RETURN CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the (L962) Headlamp Leveling Sensor Return circuit. Is the resistance below 5.0 Ohms? Yes Repair the (L962) Headlamp Leveling Sensor Return circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 6 .
6. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Is the resistance below 5.0 Ohms? Yes Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 7 .
7. (L960) HEADLAMP LEVELING SENSOR SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (L960) Headlamp Leveling Sensor Signal circuit. Is the resistance below 5.0 Ohms? Yes Repair the (L960) Headlamp Leveling Sensor Signal circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 8 .
8. (L962) HEADLAMP LEVELING SENSOR RETURN CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (L962) Headlamp Leveling Sensor Return circuit. Is the resistance above 5.0 Ohms? Yes Repair the (L962) Headlamp Leveling Sensor Return circuit for an open or high resistance. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 9 .
9. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Is the resistance above 5.0 Ohms? Yes Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for an open or high resistance. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 10 .
10. (L960) HEADLAMP LEVELING SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (L960) Headlamp Leveling Sensor Signal circuit. Is the resistance above 5.0 Ohms? Yes Repair the (L960) Headlamp Leveling Sensor Signal circuit for an open or high resistance. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 11 .
11. FRONT HEADLAMP LEVEL SENSOR Replace the Front Headlamp Level Sensor in accordance with the Service Information. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Automatic Headlamp Leveling Module (AHLM) in accordance with the Service Information. Refer to «MODULE, HEADLAMP LEVELING , REMOVAL»(ref-465939-S22349930082012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Test Complete.

Scheme 11

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Continuously with the ignition on.

The Automatic Headlamp Leveling Module (AHLM) detects the Headlamp Leveling Sensor Rear Signal circuit is out of range.

Scheme 12

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Scheme 14

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
2. (L962) HEADLAMP LEVELING SENSOR RETURN CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Rear Headlamp Level Sensor harness connector. Disconnect the Right Front Headlamp Assembly C1 harness connector. Turn the ignition on. Measure the voltage of the (L962) Headlamp Leveling Sensor Return circuit. Is any there voltage present? Yes Repair the (L962) Headlamp Leveling Sensor Return circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 3 .
3. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Measure the voltage of the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Is any there voltage present? Yes Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 4 .
4. (L963) HEADLAMP LEVELING SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE Measure the voltage of the (L963) Headlamp Leveling Sensor Signal circuit. Is any there voltage present? Yes Repair the (L963) Headlamp Leveling Sensor Signal circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 5 .
5. (L962) HEADLAMP LEVELING SENSOR RETURN CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the (L962) Headlamp Leveling Sensor Return circuit. Is the resistance below 5.0 Ohms? Yes Repair the (L962) Headlamp Leveling Sensor Return circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 6 .
6. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Is the resistance below 5.0 Ohms? Yes Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 7 .
7. (L963) HEADLAMP LEVELING SENSOR SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (L963) Headlamp Leveling Sensor Signal circuit. Is the resistance below 5.0 Ohms? Yes Repair the (L963) Headlamp Leveling Sensor Signal circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 8 .
8. (L962) HEADLAMP LEVELING SENSOR RETURN CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (L962) Headlamp Leveling Sensor Return circuit. Is the resistance above 5.0 Ohms? Yes Repair the (L962) Headlamp Leveling Sensor Return circuit for an open or high resistance. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 9 .
9. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Is the resistance above 5.0 Ohms? Yes Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for an open or high resistance. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 10 .
10. (L963) HEADLAMP LEVELING SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (L963) Headlamp Leveling Sensor Signal circuit. Is the resistance above 5.0 Ohms? Yes Repair the (L963) Headlamp Leveling Sensor Signal circuit for an open or high resistance. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 11 .
11. REAR HEADLAMP LEVEL SENSOR Replace the Rear Headlamp Level Sensor in accordance with the Service Information. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Automatic Headlamp Leveling Module (AHLM) in accordance with the Service Information. Refer to «MODULE, HEADLAMP LEVELING , REMOVAL»(ref-465939-S22349930082012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Test Complete.

Scheme 15

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Continuously with the ignition on.

The Automatic Headlamp Leveling Module (AHLM) detects a short to voltage, short to ground, or an open on the (D503) LIN Lighting circuit.

Scheme 16

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Scheme 18

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
2. (D503) LIN LIGHTING CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Right Front Headlamp Assembly C2 harness connector. Disconnect the Left Front Headlamp Assembly C5 harness connector. Turn the ignition on. Measure the voltage of the (D503) LIN Lighting circuit. Is there any voltage present? Yes Repair the (D503) LIN Lighting circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 3 .
3. (D503) LIN LIGHTING CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the (D503) LIN Lighting circuit. Is the resistance below 10K Ohms? Yes Repair the (D503) LIN Lighting circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 4 .
4. (D503) LIN LIGHTING CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (D503) LIN Lighting circuit. Is the resistance above 5.0 Ohms? Yes Repair the (D503) LIN Lighting circuit for an open or high resistance. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Replace the AHLM in accordance with the Service Information. Refer to «MODULE, HEADLAMP LEVELING , REMOVAL»(ref-465939-S22349930082012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .

Scheme 19

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Continuously with the ignition on.

The Automatic Headlamp Leveling Module (AHLM) detects a short to voltage, short to ground, or an open on the (D504) LIN Lighting circuit.

Scheme 20

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Scheme 22

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
2. (D504) LIN LIGHTING CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Right Front Headlamp Assembly C2 harness connector. Disconnect the Right Front Headlamp Assembly C5 harness connector. Turn the ignition on. Measure the voltage of the (D504) LIN Lighting circuit. Is there any voltage present? Yes Repair the (D504) LIN Lighting circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 3 .
3. (D504) LIN LIGHTING CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the (D504) LIN Lighting circuit. Is the resistance below 10K Ohms? Yes Repair the (D504) LIN Lighting circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 4 .
4. (D504) LIN LIGHTING CIRCUIT OPEN OR HIGH RESISTANCE Measure the resistance of the (D504) LIN Lighting circuit. Is the resistance above 5.0 Ohms? Yes Repair the (D504) LIN Lighting circuit for an open or high resistance. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Replace the AHLM in accordance with the Service Information. Refer to «MODULE, HEADLAMP LEVELING , REMOVAL»(ref-465939-S22349930082012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .

Scheme 23

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

With the ignition on.

The Auto Headlamp Leveling Module (AHLM) detects a low condition on the (L961) Headlamp Leveling Sensor 5 Volt Supply Circuit.

Scheme 24

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
2. FRONT HEADLAMP LEVEL SENSOR Turn the ignition off. Disconnect Front Headlamp Level Sensor. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 3 . No Replace Front Headlamp Level Sensor in accordance with the Service Information. Refer to «SENSOR, AXLE , REMOVAL»(ref-465935-S36111148522012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
3. REAR HEADLAMP LEVELING SENSOR Turn the ignition off. Disconnect Rear Headlamp Level Sensor. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 4 . No Replace Rear Headlamp Level Sensor in accordance with the Service Information. Refer to «SENSOR, AXLE , REMOVAL»(ref-465935-S36111148522012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
4. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the Right Front Headlamp Assembly C2 harness connector. Measure the resistance between ground and the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Is the resistance below 10K Ohms? Yes Repair the short to ground on the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Replace the Auto Headlamp Leveling Module (AHLM) in accordance with the Service Information. Refer to «MODULE, HEADLAMP LEVELING , REMOVAL»(ref-465939-S22349930082012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .

With the Headlamps on.

The Automatic Headlamp Leveling Module (AHLM) detects a short to voltage or open condition on the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit.

Scheme 25

Scheme 26

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
2. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Right Front Headlamp Assembly C2 harness connector. Turn the ignition on. Measure the voltage of the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Is the voltage above 5.0 volts? Yes Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 3 .
3. (L961) HEADLAMP LEVELING SENSOR 5 VOLT SUPPLY CIRCUIT OPEN Turn the ignition off. Disconnect the Front and Rear Headlamp Level Sensor harness connectors. Measure the resistance of the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit. Is the resistance above 5.0 Ohms? Yes Repair the (L961) Headlamp Leveling Sensor 5 Volt Supply circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Replace the Automatic Headlamp Leveling Module (AHLM) in accordance with the Service Information. Refer to «MODULE, HEADLAMP LEVELING , REMOVAL»(ref-465939-S22349930082012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .

Scheme 27

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Continuously with the ignition on.

The Automatic Headlamp Leveling Module (AHLM) senses voltage input below 9.0 volts for over 15 seconds.

Scheme 28

1. RELATED DTC(S) PRESENT IN PCM Turn the ignition on. With the scan tool, select View DTCs in the Powertrain Control Module (PCM). Are there any charging system or related battery voltage DTCs present in the PCM? Yes Perform the appropriate diagnostic procedure. Refer to «DIAGNOSTIC CODE INDEX»(ref-466007) . No Go To 2 .
2. CHECK FOR AN ACTIVE DTC With the scan tool, read AHLM DTCs. Does the scan tool display this DTC as active? Yes Go To 3 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
3. (F921) FUSED RUN RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the Right Front Headlamp Assembly C2 harness connector. Turn the ignition on. Measure the voltage of the (F921) Fused Run Relay Output circuit. Is battery voltage present? Yes Replace the Automatic Headlamp Leveling Module (AHLM) in accordance with the Service Information. Refer to «MODULE, HEADLAMP LEVELING , REMOVAL»(ref-465939-S22349930082012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Repair the (F921) Fused Run Relay Output circuit for an open, short to ground, or high resistance Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .

Continuously with the ignition on.

If the voltage to the Automatic Headlamp Leveling Module (AHLM) is above 16 volts for more than 15 seconds.

B21DD-16-SYSTEM VOLTAGE - CIRCUIT VOLTAGE BELOW THRESHOLD

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Continuously with the ignition on.

The Automatic Headlamp Leveling Module (AHLM) senses voltage input below 9.0 volts for over 15 seconds.

B21DD-17-SYSTEM VOLTAGE - CIRCUIT VOLTAGE ABOVE THRESHOLD

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Continuously.

If the voltage to the Automatic Headlamp Leveling Module (AHLM) is above 16 volts for more than 15 seconds.

Continuously with the ignition on.

The Headlamp Leveling Module (AHLM) is not calibrated correctly.

Ignition run time is greater than one second. Battery voltage between 9 and 16 volts. Engine run time greater than three seconds.

Bus messages not received from the Totally Integrated Power Module (TIPM) for approximately two to five seconds.

Continuously when the ignition is on.

Battery voltage between 10 and 16 volts.

Ignition Off Draw (IOD) fuse installed.

Totally Integrated Power Module (TIPM) is configured correctly.

Bus messages not received from the TIPM for approximately two to five seconds.

Continuously when the ignition is on.

Battery voltage between 10 and 16 volts.

Ignition Off Draw (IOD) fuse installed.

Totally Integrated Power Module (TIPM) is configured correctly.

Bus messages not received from the Totally Integrated Power Module (TIPM) for approximately two to five seconds.

Continuously with the ignition on.

LIN Lighting messages not received from the Left Headlamp Leveling Motor.

Scheme 29

Scheme 30

Scheme 31

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
2. (F921) FUSED RUN RELAY OUTPUT CIRCUIT OPEN OR SHORTED TO GROUND Turn the ignition off. Disconnect the Left Front Lamp Assembly C5 harness connector. Turn the ignition on. Measure the voltage of the (F921) Fused Run Relay Output circuit. Is the voltage greater than 10.0 volts? Yes Go To 3 . No Repair the (F921) Fused Run Relay Output circuit for an open or short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
3. (Z901) GROUND CIRCUITS OPEN Turn the ignition off. Measure the resistance between ground and the (Z901) Ground circuits. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the open in the (Z901) Ground circuits. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
4. MEASURE THE VOLTAGE OF THE (D503) LIN LIGHTING CIRCUIT Turn the ignition on. Measure the voltage of the (D503) LIN Lighting circuit. Is voltage present? Yes Replace the Left Headlamp Assembly in accordance with the Service Information. Refer to «UNIT, FRONT LAMP , REMOVAL»(ref-465935-S27724100512012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 5 .
5. (D503) LIN LIGHTING CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the Right Front Headlamp Assembly C2 harness connector. Measure the resistance between ground and the (D503) LIN Lighting circuit. Is the resistance below 10K Ohms? Yes Repair the short to ground in the (D503) LIN Lighting circuit. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 6 .
6. (D503) LIN LIGHTING CIRCUIT OPEN Measure the resistance of the (D503) LIN Lighting circuit. Is the resistance below 5.0 Ohms? Yes Replace the AHLM in accordance with the Service Information. Refer to «MODULE, HEADLAMP LEVELING , REMOVAL»(ref-465939-S22349930082012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Repair the open in the (D503) LIN Lighting circuit. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .

Continuously with the ignition on.

LIN Lighting messages not received from the Right Headlamp Leveling Motor.

Scheme 32

Scheme 33

Scheme 34

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
2. (F921) FUSED RUN RELAY OUTPUT CIRCUIT OPEN OR SHORTED TO GROUND Turn the ignition off. Disconnect the Right Front Lamp Assembly C5 harness connector. Turn the ignition on. Measure the voltage of the (F921) Fused Run Relay Output circuit. Is the voltage greater than 10.0 volts? Yes Go To 3 . No Repair the (F921) Fused Run Relay Output circuit for an open or short to ground. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
3. (Z909) GROUND CIRCUITS OPEN Turn the ignition off. Measure the resistance between ground and the (Z909) Ground circuits. Is the resistance below 5.0 Ohms? Yes Go To 4 . No Repair the open in the (Z909) Ground circuits. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .
4. MEASURE THE VOLTAGE OF THE (D504) LIN LIGHTING CIRCUIT Turn the ignition on. Measure the voltage of the (D504) LIN Lighting circuit. Is voltage present? Yes Replace the Right Headlamp Assembly in accordance with the Service Information. Refer to «UNIT, FRONT LAMP , REMOVAL»(ref-465935-S27724100512012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 5 .
5. (D504) LIN LIGHTING CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect the Right Front Headlamp Assembly C2 harness connector. Measure the resistance between ground and the (D504) LIN Lighting circuit. Is the resistance below 10K Ohms? Yes Repair the short to ground in the (D504) LIN Lighting circuit. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Go To 6 .
6. (D504) LIN LIGHTING CIRCUIT OPEN Measure the resistance of the (D504) LIN Lighting circuit. Is the resistance below 5.0 Ohms? Yes Replace the AHLM in accordance with the Service Information. Refer to «MODULE, HEADLAMP LEVELING , REMOVAL»(ref-465939-S22349930082012042300000) . Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) . No Repair the open in the (D504) LIN Lighting circuit. Perform the BODY VERIFICATION TEST. Refer to «STANDARD PROCEDURE»(ref-465990-S29694203322012042300000) .