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Symptoms - Lighting > < Interior Lights Malfunction

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Headlamps Malfunction

Diagnostic Instructions

•  Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
•  Review Strategy Based Diagnosis for an overview of the diagnostic approach.
•  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information



Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance

Low Beam Headlamp Supply Voltage
1
1
3
-

High Beam Headlamp Supply Voltage
2
2
4
-

Headlamp Low Beam Relay Control
3
1
1
-

Headlamp High Beam Relay Control
4
2
1
-

Headlamp Switch Headlamps OFF Signal
B257A 00
6
6*
-

Headlamp Switch Headlamps ON Signal
B257A 00
1
1*
-

Park Lamp Switch ON Signal
B257A 00
B257A 00
B257A 00*
-

Flash to Pass Switch Signal
4
5
5
-

Headlamp Dimmer Switch High Beam Signal
4
2
2
-

Low Beam Headlamp Ground
-
1
-
-

High Beam Headlamp Ground
-
2
-
-

Headlamp Switch Ground
-
1, 2
-
-

Turn Signal/Multi-Function Switch Ground
-
2, 5
-
-

* Internal damage to the headlamp switch may occur if shorted to B+

1. Low beam headlamp(s) inoperative

2. High beam headlamp(s) inoperative

3. Low beam headlamp(s) always ON

4. High beam headlamp(s) always ON

5. Flash to Pass inoperative

6. Headlamp defeat inoperative
 

Circuit/System Description

The vehicle headlamps are controlled by the body control module (BCM) based on inputs from the headlamp switch and the turn signal/multi-function switch. The headlamp switch has four positions: OFF, AUTOMATIC LIGHT, PARKING LIGHT, and LOW BEAM. The default headlamp switch position is AUTOMATIC LIGHT, in which the BCM uses the ambient light sensor to determine when headlamps are needed. The OFF portion of the headlamp switch is a momentary switch which overrides the automatic headlamp and will turn OFF the vehicle headlamps. When in the OFF position, the headlamp switch grounds the headlamp switch headlamps OFF signal circuit, prompting the BCM to turn OFF the headlamps. The Park position of the headlamp switch will only illuminate the vehicle parking lamps. The LOW BEAM position of the headlamp switch will illuminate both the parking lamps, as well has the headlamps. With the headlamp switch in the LOW BEAM position, the headlamp switch headlamps on signal circuit is grounded, prompting the BCM to turn on the headlamps, regardless of other factors such as ambient light.

The headlamp high beams are controlled through the flash to pass switch and the headlamp dimmer switch, both located in the turn signal/multi-function switch. The flash to pass switch is a momentary type switch, designed to illuminate the high beams as long as the switch is held. With the switch closed, the flash to pass switch signal circuit is grounded, prompting the BCM to turn on the high beam lamps. The headlamp dimmer switch allows the operator to select between full time high or low beam operation. Unlike the flash to pass switch, it is not a momentary switch. When the headlamp dimmer switch is in the high beam position, the headlamp dimmer switch high beam signal circuit is grounded. This prompts the BCM to turn on the high beam lamps.

Without High Intensity Discharge (HID) Headlamps RPO T4A

The BCM controls the headlamps based on the inputs explained above. When a low beam request is received, the BCM supplies an B+ through the headlamp low beam relay for the left headlamp and through daytime running lamp relay right for the right headlamp. This then applies B+ to the low beam headlamps, illuminating the low beam headlamps. When a high beam request is received, the BCM grounds the headlamp high beam relay control circuit. This energizes the coil in the headlamp high beam relay, causing the relay switch to close. This then applies B+ to both high beam headlamps through the left high beam and right high beam fuses, illuminating the high beam headlamps.

With High Intensity Discharge (HID) Headlamps RPO T95/T4F

The BCM controls the headlamps based on the inputs explained above. When a low beam request is received, the BCM grounds the headlamp low beam relay control circuit. This energizes the coil in the headlamp low beam relay, causing the relay switch to close. This then applies B+ to both low beam high intensity discharge (HID) headlamps through the left low beam and right low beam fuses, illuminating the low beam headlamps. When a high beam request is received, the BCM grounds the headlamp high beam relay control circuit. This energizes the coil in the high beam relay, causing the relay switch to close. This then applies B+ to both low beam HID headlamps through the left high beam and right high beam fuses, illuminating the high beam headlamps.

Reference Information


Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics


Connector End View Reference

Component Connector End Views


Description and Operation

Exterior Lighting Systems Description and Operation


Electrical Information Reference


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, observe the scan tool Automatic Headlamps Disable Switch parameter while cycling the headlamp switch between the Automatic Light and OFF positions. The parameter should cycle between Active and Inactive.
⇒ If the parameter does not cycle between the specified values, refer to Headlamp Switch Malfunction.
2. Observe the scan tool Headlamps On Switch parameter while cycling the headlamp switch between the Automatic Light and Park Lights On position. The parameter should cycle between Active and Inactive.
⇒ If the parameter does not cycle between the specified values, refer to Headlamp Switch Malfunction.
3. With the low beams ON, observe the scan tool Headlamps Flash Switch parameter while pulling and releasing the turn signal/multi-function switch. The parameter should cycle between Active and Inactive.
⇒ If the parameter does not cycle between the specified values, refer to Turn Signal/Multi-Function Switch Malfunction.
4. With the low beams ON, observe the scan tool High Beam Command parameter while switching the headlamp dimmer switch between the low and high beam positions. The parameter should cycle between Active and Inactive.
⇒ If the parameter does not cycle between the specified values, refer to Turn Signal/Multi-Function Switch Malfunction.
5. Command the Low Beams ON and OFF with a scan tool. Verify the low beam headlamps turn ON and OFF.
⇒ If the low beam headlamps do not cycle between the commanded states, refer to Low Beam Headlamp Malfunction.
6. Command the High Beams ON and OFF with a scan tool. Verify the low beam headlamps turn ON and OFF.
⇒ If the high beam headlamps do not cycle between the commanded states, refer to High Beam Headlamp Malfunction.

Circuit/System Testing

Headlamp Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch.
2. Disconnect the negative terminal of the C1 Battery.
3. Test for less than 5.0 Ω between the ground circuit terminal 6 and ground.
⇒ If greater than the specified range, test the ground circuit for an open/high resistance.
4. Reconnect the negative terminal to the C1 Battery.
5. Ignition ON, test for B+ between the signal circuit terminals listed below and ground.
  •  Headlamp switch low beams ON signal terminal 4
  •  Park light switch ON signal terminal 3
  •  Headlamp switch OFF signal terminal 5
⇒ If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
6. Install a 3 A fused jumper wire between the park Light ON signal circuit S30 Headlamp Switch terminal 3 and ground. Verify the scan tool Parklamp Switch parameter changes from Active to Inactive.
⇒ If always Inactive, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
⇒ If always Active, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
7. Install a 3 A fused jumper wire between the low beams ON signal circuit terminal 4 and ground. Verify the scan tool Headlamp ON Switch parameter changes from Inactive to Active.
⇒ If always Inactive, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
⇒ If always Active, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
8. Remove the jumper wire. Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground. Verify the scan tool Automatic Headlamp Disable Switch parameter is Active.
⇒ If always Inactive, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
⇒ If always Active, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
9. If all circuits test normal, replace the S30 Headlamp Switch.

Turn Signal/Multi-Function Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the S78 Turn Signal/Multifunction Switch.
2. Disconnect the negative terminal of the C1 Battery.
3. Test for less than 5.0 Ω between the ground circuit terminal 3 and ground.
⇒ If greater than the specified range, test the ground circuit for an open/high resistance.
4. Reconnect the negative terminal to the C1 Battery.
5. Ignition ON, verify the scan tool Headlamps Flash Switch parameter is Inactive.
⇒ If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
6. Verify the scan tool High Beam Select Switch parameter is Inactive.
⇒ If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
7. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Headlamps Flash Switch parameter is Active.
⇒ If not the specified value, test the signal circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
8. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool High Beam Select Switch parameter is Active.
⇒ If not the specified value, test the signal circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
9. If all circuits test normal, test or replace the S78 Turn Signal/Multifunction Switch.

Low Beam Headlamp Malfunction - Without HID Headlamps RPO T4A

1. Ignition OFF, disconnect the appropriate harness connector at the inoperative headlamp lamp listed below:
  •  E13L Headlamp Assembly - Left
  •  E13R Headlamp Assembly - Right
2. Disconnect the negative terminal of the C1 Battery.
3. Test for less than 5 Ω between the appropriate headlamp ground circuit harness connector terminal listed below and ground:
  •  E13L Headlamp Assembly - Left harness connector terminal 1
  •  E13R Headlamp Assembly - Right harness connector terminal 1
⇒  If greater than the specified value, test the appropriate ground circuit for an open/high resistance.
4. Reconnect the negative terminal to the C1 Battery.
5. Disconnect the appropriate relay listed below:
  •  KR42L Daytime Running Lamp Relay - Left
  •  KR42R Daytime Running Lamp Relay - Right
6. Install a 10 A fused jumper wire between the appropriate relay control circuit terminal 30 and control circuit terminal 87A.
7. Connect a test lamp between the appropriate low beam control circuit harness connector terminal listed below and ground.
  •  E13L Headlamp Assembly - Left harness connector terminal 3
  •  E13R Headlamp Assembly - Right harness connector terminal 3
8. Command the appropriate Low Beam test ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
⇒ If the test lamp is always OFF, test the appropriate control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
⇒ If the test lamp is always ON, test the appropriate control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
9. If all circuits test normal, test or replace the appropriate inoperative relay.

High Beam Headlamp Malfunction - Without HID Headlamps RPO T4A

1. Ignition OFF, disconnect the appropriate harness connector at the inoperative headlamp lamp listed below:
  •  E13L Headlamp Assembly - Left
  •  E13R Headlamp Assembly - Right
2. Disconnect the negative terminal of the C1 Battery.
3. Test for less than 5 Ω between the appropriate headlamp ground circuit harness connector terminal 1 and ground.
⇒ If greater than the specified value, test the ground circuit for an open/high resistance.
4. Reconnect the negative terminal to the C1 Battery.
5. Remove the appropriate fuse listed below:
  •  F22UA Left High Beam
  •  F41UA Right High Beam
6. Ignition ON, verify that the headlamp does not illuminate.
⇒ If the headlamp illuminates, test the signal circuit for a short to voltage.
7. Install a 10 A fused jumper wire between appropriate fuse output contact and B+. Verify that the appropriate high beam lamp illuminates.
⇒ If the high beam lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate bulb.
8. Ignition OFF, disconnect the harness connector at the X50A Fuse Block - Underhood.
9. Connect a test lamp between the B+ and the control circuit terminal 18 X2.
10. Command the high beam Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
⇒ If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
⇒ If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
11. If all circuits test normal, replace the X50A Fuse Block - Underhood.

Low Beam Headlamp Malfunction - With HID Headlamps RPO T95/T4F

1. Ignition OFF, disconnect the KR49 Headlamp Low Beam Relay.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminals listed below and ground:
  •  Terminal 30
  •  Terminal 86
⇒ If the test lamp does not illuminate, test the B+ circuit for a short to ground or open/high resistance.
3. Connect a test lamp between the control circuit of KR49 Headlamp Low Beam Relay terminal 85 and B+ .
4. Command the Headlamp Low Beam Command ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
⇒ If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
⇒ If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
5. Ignition OFF, reconnect the KR49 Headlamp Low Beam Relay.
6. Disconnect the appropriate harness connector at the inoperative headlamps listed below:
  •  E13L Headlamp Assembly - Left
  •  E13R Headlamp Assembly - Right
7. Disconnect the negative terminal of the C1 Battery.
8. Test for less than 5 Ω between the appropriate headlamp ground circuit harness connector terminal 10 and ground.
⇒ If greater than the specified value, test the ground circuit for an open/high resistance.
9. Reconnect the negative terminal to the C1 Battery.
10. Reconnect the harness connector at the inoperative headlamp.
11. Remove the appropriate fuse listed below:
  •  F25UA Left Low Beam
  •  F24UA Right Low Beam
12. Verify that the appropriate headlamp does not illuminate.
⇒ If the headlamp illuminates, test the fuse output circuit for a short to voltage.
13. Install a 10 A fused jumper wire between appropriate fuse output contact and B+. Verify that the appropriate high beam illuminates.
⇒ If the headlamp does not illuminate, test the fuse output circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate bulb.
⇒ If the headlamp illuminates replace the KR49 Headlamp Low Beam Relay.

Component Testing

Headlamp Switch

1. Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch.
2. Test for infinite resistance between the signal terminal 5 and the ground terminal 6 with the switch in the Automatic Light position.
⇒ If not the specified value, replace the S30 Headlamp Switch.
3. Test for infinite resistance between the signal terminal 4 and the ground terminal 6 with the switch in the Automatic Light position.
⇒ If not the specified value, replace the S30 Headlamp Switch.
4. Test for infinite resistance between the signal terminal 3 and the ground terminal 6 with the switch in the Automatic Light position.
⇒ If not the specified value, replace the S30 Headlamp Switch.
5. Test for less than 2.0 Ω of resistance between the signal terminal 5 and the ground terminal 6 with the switch in the OFF position.
⇒ If not the specified value, replace the S30 Headlamp Switch.
6. Test for less than 2.0 Ω of resistance between the signal terminal 4 and the ground terminal 6 with the switch in the Low Beam position.
⇒ If not the specified value, replace the S30 Headlamp Switch.
7. Test for less than 2.0 Ω of resistance between the signal terminal 3 and the ground terminal 6 with the switch in the Parking Light position.
⇒ If not the specified value, replace the S30 Headlamp Switch.

Turn Signal/Multi-Function Switch

1. Ignition OFF, disconnect the harness at the S78 Turn Signal/Multifunction Switch.
2. Test for infinite resistance between the signal terminal 4 and the ground terminal 3 with the flash to pass switch in the open position.
⇒ If not the specified value, replace the S78 Turn Signal/Multifunction Switch.
3. Test for infinite resistance between the signal terminal 2 and the ground terminal 3 with the headlamp dimmer switch in the Low Beam position.
⇒ If not the specified value, replace the S78 Turn Signal/Multifunction Switch.
4. Test for less than 2.0 Ω of resistance between the signal terminal 4 and the ground terminal 3 with the flash to pass switch in the closed position.
⇒ If not the specified value, replace the S78 Turn Signal/Multifunction Switch.
5. Test for less than 2.0 Ω of resistance between the signal terminal 2 and the ground terminal 3 with the headlamp dimmer switch in the High Beam position.
⇒ If not the specified value, replace the S78 Turn Signal/Multifunction Switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•  Control Module References for BCM replacement, setup and programming

Symptoms - Lighting > < Interior Lights Malfunction