Lighting and Signalling Systems: Diagnosis Saab 9-4X I

Diagnostic Instructions

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2750 01

Horn Relay Secondary Circuit Short to Battery

DTC B2750 02

Horn Relay Secondary Circuit Short to Ground

DTC B2750 04

Horn Relay Secondary Circuit Open

Diagnostic Fault Information

Conditions for Running the DTC

When the horn output is actively being requested by the BCM.

Conditions for Setting the DTC

B2750 01

The BCM detects a short to voltage in the horn relay control circuit.

B2750 02

The BCM detects a short to ground in the horn relay control circuit.

B2750 04

The BCM detects an open/high resistance in the horn relay control circuit.

Action Taken When the DTC Sets

B2750 01, B2750 04

The horn will be inoperative.

B2750 02

The horn will sound continuously until the horn is disconnected or when the horn overheats and becomes inoperative.

Conditions for Clearing the DTC

1. The DTC clears when the fault is no longer detected.
2. The current DTC will become history when the request for the output is removed.
3. The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

Scan Tool Reference

CONTROL MODULE REFERENCES for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the X50A underhood fuse block.
2. Connect a test lamp between the control circuit terminal 25 and B+.
3. Ignition ON, command the Horn Relay Command ON and OFF with the scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
4. 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 BCM.
5. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
6. If all circuits test normal, replace the X50A underhood fuse block.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC Descriptor

DTC B0655 5A

Brake Lamp Switch Circuit Not Plausible

When the brake pedal is applied.

The trailer brake control module receives a serial data message from the BCM that the brakes have been applied, but the trailer brake control module does not detect a signal voltage on the center high mounted stop lamp control circuit.

The brake lights on the trailer will be inoperative

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the K67 trailer brake control module.
2. Connect a test lamp between the signal circuit terminal 14 and ground.
3. Ignition ON, command the Center Brake Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF while changing between the commanded states.
4. If the test lamp is always ON, test the signal circuit for a short to voltage.
5. If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance.
6. If all circuits test normal, replace the K67 trailer brake control module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B096A 02

Hazard Lamps Switch Backlight Circuit Short to Ground

The ignition is ON.

B096A 02

The BCM detects a short to ground on the LED backlight lamp control circuit.

The BCM will not dim or illuminate any LED backlighting supplied by the backlight lamp control circuits.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the S26 Hazard Lamps Switch.
2. Test for less than 5 ohms between the ground circuit terminal 1 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the backlight control circuit of the S26 Hazard Lamps Switch terminal 5 and ground.
5. Ignition ON, vary the interior lamp dimming switch from dim to full bright. The test lamp should dim and then become full bright.
6. If the test lamp cannot be dimmed, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.
7. If the test lamp is always OFF, test the control circuit for open/high resistance or short to ground. If the circuit tests normal, replace the K9 body control module.
8. If all circuits test normal, replace the S26 Hazard Lamps Switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B1480 02

Battery Rundown Protection Circuit Short to Ground

1. The system voltage is between 9-16 V.
2. The DTC can only run when the output is activated.

The BCM detects a short to ground in the battery saver relay set circuit.

The module output driver will be shut down and not supply voltage to the battery saver relay set circuit.

1. The current DTC will clear when the module request for the output is removed or the malfunction is no longer present.
2. A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the KR104A battery saver relay.
2. Connect a test lamp between the relay control circuit and ground.
3. Enable and disable the batter saver mode. The test lamp should turn ON and OFF when changing the relay latch positions.
4. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
5. If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 BCM.
6. If all circuits test normal, test or replace the KR104A battery saver relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2530 02

Front Fog Lamps Control Circuit Short to Ground

Front fog lamps ON.

The BCM detects a short to ground on the front fog lamp relay control circuit.

The front fog lamps will always be illuminated.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES

1. Ignition OFF, disconnect the X5 harness connector at the K9 BCM.
2. Ignition ON, test for B+ between the control circuit terminal 10 and ground.
3. If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A underhood fuse block.
4. If all circuits test normal, replace the K9 BCM.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2540 02

Rear Fog Lamps Control Circuit Short to Ground

Rear fog lamp activated

The BCM detects a short to ground on the rear fog lamp control circuit.

The rear fog lamp will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the E5 fog lamp-rear.
2. Test for less than 30 ohms between the ground circuit terminal C and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the control circuit terminal A and ground.
5. Ignition ON, command the Rear Fog Lamp(s) Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
7. 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 BCM.
8. If all circuits test normal, replace the E5 fog lamp-rear.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2545 01

Backup Lamps Circuit Short to Battery

DTC B2545 02

Backup Lamps Circuit Short to Ground

DTC B2545 04

Backup Lamps Circuit Open

Reverse Gear engaged.

B2545 01

The BCM detects a short to voltage on the backup lamps control circuit.

B2545 02

The BCM detects a short to ground on the backup lamps control circuit.

B2545 04

The BCM detects an open/high resistance both backup lamps control circuits.

For B2545 01, both backup lamps will be continuously illuminated.

For B2545 02 and B2545 04, both backup lamps will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X2 harness connector K9 BCM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the X2 harness connector K9 BCM
5. Disconnect the harness connector at the E5A backup lamp listed below: X3 harness connector E5E tail lamp-left (Without T79) X1 harness connector E5E tail lamp-left (With T79) X3 harness connector E5F tail lamp-right (Without T79) X1 harness connector E5F tail lamp-right (With T79)
6. Test for less than 30 ohms between the ground circuit terminal listed below and ground. E5E tail lamp-left (Without T79) ground terminal 2 E5E tail lamp-left (With T79) ground terminal C E5F tail lamp-right (Without T79) ground terminal 2 E5F tail lamp-right (With T79) ground terminal C
7. If greater than the specified range, test the ground circuit for an open/high resistance.
8. Connect a test lamp between the control circuit terminal listed below and ground: E5E tail lamp-left (Without T79) control terminal 1 E5E tail lamp-left (With T79) control terminal D E5F tail lamp-right (Without T79) control terminal 1 E5F tail lamp-right (With T79) control terminal D
9. Engine running, command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the selected states.
10. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
11. 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 BCM.
12. If all circuits test normal, test or replace the E5A backup lamp-left and the E5B backup lamp-right.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B256A 02

Liftgate Lamp Control Circuit Short to Ground

1. Ignition ON.
2. The system voltage is between 9-16 V.

The BCM detects a short to ground on the cargo lamp control circuit.

The cargo lamps are inoperative.

A current DTC clears when the diagnostic runs and passes.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the appropriate cargo lamp.
2. Test for less than 5 ohms between the ground circuit terminal 2 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the control circuit terminal 1 and ground.
5. Command the Cargo Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
7. If the test lamp is always OFF, test the control circuit for a short to round or open/high resistance. If the circuit tests normal, replace the K9 BCM.
8. If all circuits test normal, replace the cargo lamp.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2575 01

Left Headlamp Control Circuit Short to Battery

DTC B2575 02

Left Headlamp Control Circuit Short to Ground

DTC B2575 04

Left Headlamp Control Circuit Open

DTC B2699 01

Right Headlamp Control Circuit Short to Battery

DTC B2699 02

Right Headlamp Control Circuit Short to Ground

DTC B2699 04

Right Headlamp Control Circuit Open

The headlamps are turned ON.

B2575 01

The BCM detects a short to voltage on the left headlamp low beam control circuit.

B2575 02

The BCM detects a short to ground on the left headlamp low beam control circuit.

B2575 04

The BCM detects an open on the left headlamp low beam control circuit or an open/high resistance on the left headlamp low beam ground circuit.

B2699 01

The BCM detects a short to voltage on the right headlamp low beam control circuit.

B2699 02

The BCM detects a short to ground on the right headlamp low beam control circuit.

B2699 04

The BCM detects an open on the right headlamp low beam control circuit or an open/high resistance on the right headlamp low beam ground circuit.

For B2575 02, B2575 04, B2699 02 or B2699 04, the appropriate headlamp low beam will be inoperative.

For B2575 01 or B2699 01, the appropriate headlamp low beam will be continuously illuminated.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness X1 harness connector at the K9 BCM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal listed below and ground: B+ circuit terminal 3 B+ circuit terminal 4
3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the harness X1 harness connector at the K9 BCM.
5. Disconnect the inline harness connector at the appropriate E4 headlamp low beam listed below: E4G headlamp-left low beam X115 inline harness connector E4F headlamp-right low beam X116 inline harness connector
6. Connect a test lamp between the control circuit terminal G and ground.
7. Ignition ON, command the low beam lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF while changing between the commanded states.
8. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
9. 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 BCM
10. If all circuits test normal, replace the headlamp bulb or the headlamp.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B257A 00

Headlamp Switch Input Signals Correlation Malfunction

The ignition is in the ON, ACCESSORY or RUN position.

The BCM receives an unexpected signal along either the headlamp switch OFF circuit or the headlamp ON circuit.

The automatic headlamps will malfunction.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
2. Ignition OFF, test for less than 30 ohms between the ground circuit terminal 6 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify the scan tool Park Lamps Switch parameter is Inactive.
5. If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K9 BCM.
6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 6. Verify the scan tool Park Lamps Switch parameter is Active.
7. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
8. Verify the scan tool Headlamps On Switch parameter is Inactive.
9. If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 BCM.
10. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the ground circuit terminal 6. Verify the scan tool Headlamps On Switch parameter is Active.
11. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
12. Verify the scan tool Automatic Headlamps Disable Switch parameter is Inactive.
13. If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 BCM.
14. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 6. Verify the scan tool Automatic Headlamps Disable Switch parameter is Active.
15. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
16. If all circuits test normal, test or replace the S30 headlamp switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B257B 03

Lighting Control Switch Signal Low Voltage

DTC B257B 07

Lighting Control Switch Signal High Voltage

The ignition is ON.

B257B 03

The BCM detects a voltage that is lower than 0.3 V on the dimming voltage circuit.

B257B 07

The BCM detects a voltage that is greater than 12.2 V on dimming voltage circuit.

The BCM will not dim or illuminate any LED backlighting supplied by the backlight lamp control circuits.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch.
2. Ignition ON, test for B+ between the B+ reference circuit terminal 1 and ground.
3. If less than the specified range, test the B+ reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
4. Ignition ON, test for less than 0.3 V between signal circuit terminal 12 and ground.
5. If greater than the specified range, test the signal circuit pin 12 for a short to voltage. If the circuit tests normal, replace the BCM K9.
6. Reconnect the harness connector at the S30 Headlamp Switch.
7. Dim the interior backlighting with the S30 Headlamp Switch.
8. Disconnect the harness connector at the S30 Headlamp Switch.
9. Install a 3 A fused jumper wire between the signal circuit terminal 12 and the B+ reference circuit terminal 1. The interior backlighting should now be dimmed.
10. If the interior backlighting is not dimmed, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
11. If all circuits test normal, replace the S30 Headlamp Switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B257C 00

Left Headlamp Assembly Malfunction

DTC B257D 00

Right Headlamp Assembly Malfunction

The headlamps are turned ON.

B257C 00

The headlamp control module detects a fault in the left low beam control circuit or an open/high resistance is the left low beam ground circuit.

B257D 00

The headlamp control module detects a fault in the right low beam control circuit or an open/high resistance is the right low beam ground circuit.

The appropriate headlamp is inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

Relay Test

1. Ignition OFF, disconnect the KR49 headlamp low beam relay.
2. Test for 60-180 ohms between terminals 85 and 86.
3. If not within the specified range, replace the KR49 headlamp low beam relay.
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87
5. If not the specified value, replace the KR49 headlamp low beam relay.
6. Install a 15A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
7. If greater than the specified range, replace the KR49 headlamp low beam relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2580 02

High Beam Control Circuit Short to Ground

High beam lamps ON.

The BCM detects a short to ground in the headlamp high beam relay control circuit.

The high beam headlamps will always be illuminated.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X5 harness connector at the K9 BCM.
2. Ignition ON, test for B+ between the control circuit terminal 18 and ground.
3. If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the X50A underhood fuse block.
4. If all circuits test normal, replace the K9 BCM.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2585 02

Park Lamps Control Circuit Short to Ground

DTC B3867 02

Right Park Lamp Control Circuit Short to Ground

Headlamp switch in park or low beam position.

B2585 02

The BCM detects a short to ground on the left side park lamp control circuit.

B3867 02

The BCM detects a short to ground on the right side park lamp control circuit.

The appropriate park lamps will be inoperative

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B258A 01

Low Beam Control Circuit Short to Battery

DTC B258A 02

Low Beam Control Circuit Short to Ground

DTC B258A 04

Low Beam Control Circuit Open

The headlamp switch is in the low beam position.

B258A 01

The BCM detects a short to voltage in the headlamp low beam relay control circuit.

B258A 02

The BCM detects a short to ground in the headlamp low beam relay control circuit.

B258A 04

The BCM detects an open/high resistance in the headlamp low beam relay control circuit.

B258A 01 or B258A 04

The low beam headlamps will be inoperative.

B258A 02

The low beam headlamps will be continuously illuminated.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the KR49 headlamp low beam relay.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 30 and ground.
3. If the test lamp illuminates, test the control circuit for a short to voltage
4. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.
5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
6. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
7. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
8. Connect a 15A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30. Verify the E4G headlamp-left low beam and the E4H headlamp-right low beam are activated.
9. If the E4G headlamp-left low beam and the E4H headlamp-right low beam do not activate, test the control circuit for a short to ground or an open/high resistance.
10. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
11. Ignition ON, command the low beam lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
12. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
13. 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 BCM.
14. If all circuits test normal, test or replace the KR49 headlamp low beam relay.

1. Ignition OFF, disconnect the KR49 headlamp low beam relay.
2. Test for 60-180 ohms between terminals 85 and 86.
3. If not within the specified range, replace the KR49 headlamp low beam relay.
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87
5. If not the specified value, replace the KR49 headlamp low beam relay.
6. Install a 15A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
7. If greater than the specified range, replace the KR49 headlamp low beam relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2600 01

Left Daytime Running Lamps Control Circuit Short to Battery

DTC B2600 02

Left Daytime Running Lamps Control Circuit Short to Ground

DTC B2600 04

Left Daytime Running Lamps Control Circuit Open

DTC B2605 01

Right Daytime Running Lamps Control Circuit Short to Battery

DTC B2605 02

Right Daytime Running Lamps Control Circuit Short to Ground

DTC B2605 04

Right Daytime Running Lamps Control Circuit Open

1. Engine is running.
2. Headlamp switch in AUTO position.
3. The ambient light is day.

B2600 01 or B2605 01

The BCM detects a short to voltage on the daytime running lamp control circuit

B2600 02 or B2605 04

The BCM detects a short to ground on the daytime running lamp control circuit

B2600 04 or B2605 04

The BCM detects an open/high resistance on the daytime running lamp control circuit

B2600 01 or B2605 01

The daytime running lamp will be continuously illuminated.

B2600 02, B2600 04, B2605 02 or B2605 04

The daytime running lamp will be inoperative

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector K9 BCM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the X1 harness connector K9 BCM
5. Ignition OFF, disconnect the inline harness connector listed below: E4C daytime running lamp - left X111 inline harness connector E4D daytime running lamp - right X116 inline harness connector
6. Connect a test lamp between the control circuit terminal G and ground.
7. Command the appropriate Dedicated Daytime Running Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
8. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
9. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 BCM.
10. If all circuits test normal, replace the daytime running lamp bulb.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B260A 00

Backlight and Display Dimming Request Circuit Malfunction

The ignition is ON. Parklamps are illuminated.

The BCM detects the instrument panel dimmer switch is ON for greater than 60 seconds.

The BCM will not dim or illuminate any LED backlighting supplied by the backlight lamp control circuits.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal 6 and ground.
3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 body control module.
4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
5. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
6. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the BCM K9.
7. Verify the scan tool LED Backlight Dimming Command is less than 5 percent.
8. If greater than the specified range, test the signal circuit pin 12 for a short to voltage. If the circuit tests normal, replace the BCM K9.
9. Install a 3 A fused jumper wire between the signal circuit terminal 12 and the 5 V reference circuit terminal 5. Verify the scan tool LED Backlight Dimming Command is greater than 95 percent.
10. If less than the specified range, 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.
11. If all circuits test normal, test or replace the S30 Headlamp Switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B260B 01

Left Daytime Running Lamp Relay Control Circuit Short to Battery

DTC B260B 02

Left Daytime Running Lamp Relay Control Circuit Short to Ground

DTC B260B 04

Left Daytime Running Lamps Relay Control Circuit Open

DTC B260C 01

Right Daytime Running Lamp Relay Control Circuit Short to Battery

DTC B260C 02

Right Daytime Running Lamp Relay Control Circuit Short to Ground

DTC B260C 04

Left Daytime Running Lamps Relay Control Circuit Open

1. Engine is running.
2. Headlamp switch in AUTO position.
3. The ambient light is day.

B260B 01 or B260C 01

The BCM detects a short to voltage on the daytime running lamp relay control circuit.

B260B 02 or B260C 02

The BCM detects a short to ground on the daytime running lamp relay control circuit.

B260B 04 or B260C 04

The BCM detects an open/high resistance on the daytime running lamp relay control circuit.

B260B 01 or B260C 01

The appropriate daytime running lamp will be continuously illuminated.

B260B 02, B260C 04, B260B 02 or B260C 04

The appropriate daytime running lamp will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES

1. Ignition OFF, disconnect the appropriate KR42 daytime running lamp relay.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
5. Command the appropriate Front Park Lamp test with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
6. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
7. 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 BCM.
8. If all circuits test normal, test or replace the KR42 daytime running lamp relay.

1. Ignition OFF, disconnect the appropriate KR42 daytime running lamp relay.
2. Test for 60-180 ohms between terminals 85 and 86.
3. If not within the specified range, replace the KR42 daytime running lamp relay.
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87
5. If not the specified value, replace the KR42 daytime running lamp relay.
6. Install a 15A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
7. If greater than the specified range, replace the KR42 daytime running lamp relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B260D 01

Left Daytime Running Lamp and Front Park Lamp Control Circuit Short to Battery

DTC B260D 02

Left Daytime Running Lamp and Front Park Lamp Control Circuit Short to Ground

DTC B260D 04

Left Daytime Running Lamp and Front Park Lamp Control Circuit Open

DTC B260E 01

Right Daytime Running Lamp and Front Park Lamp Control Circuit Short to Battery

DTC B260E 02

Right Daytime Running Lamp and Front Park Lamp Control Circuit Short to Ground

DTC B260E 04

Right Daytime Running Lamp and Front Park Lamp Control Circuit Open

1. Engine is running.
2. Headlamp switch in AUTO position.
3. The ambient light is day.

B260D 01 or B260E 01

The BCM detects a short to voltage on the daytime running lamp control circuit

B260D 02 or B260E 02

The BCM detects a short to ground on the daytime running lamp control circuit

B260D 04 or B260E 04

The BCM detects an open/high resistance on the daytime running lamp control circuit

B260D 01 or B260E 01

The daytime running lamp will be continuously illuminated.

B260D 02, B260D 04, B260E 02 or B260E 04

The daytime running lamp will be inoperative

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES

1. Ignition OFF, disconnect the X1 harness connector K9 BCM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the X1 harness connector K9 BCM
5. Ignition OFF, disconnect the inline harness connector listed below: E4C daytime running lamp - left X111 inline harness connector E4D daytime running lamp - right X116 inline harness connector
6. Connect a test lamp between the control circuit terminal G and ground.
7. Command the appropriate Dedicated Daytime Running Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
8. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
9. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 BCM.
10. If all circuits test normal, replace the daytime running lamp bulb.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2615 02

Passenger Compartment Dimming 2 Circuit Short to Ground

The BCM attempts to illuminate the courtesy lamps.

The BCM detects a short to ground on the courtesy lamp control circuit.

The BCM will not attempt to activate courtesy lamps.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.

CONTROL MODULE REFERENCES

1. Disconnect the harness connector at the appropriate courtesy lamp.
2. Ignition OFF, scan tool OFF, doors CLOSED, interior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal listed below and ground: Instrument Panel Courtesy Lamp - terminal 2 Door Courtesy Lamp - terminal 2 Overhead Console Courtesy/Reading Lamp - terminal 2 Rear Courtesy/Reading Lamp - terminal B
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the control circuit terminal listed below and ground: Instrument Panel Courtesy Lamp - terminal 1 Door Courtesy Lamp - terminal 1 Overhead Console Courtesy/Reading Lamp - terminal 3 Rear Courtesy/Reading Lamp - terminal C
5. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
6. 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 BCM.
7. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
8. If all circuits test normal, replace the courtesy lamp.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2625 02

Display Dimming Pulse Width Modulation Output Circuit Short to Ground

The ignition is ON.

The BCM detects a short to ground in the LED dimming control circuit.

Actions Taken When the DTC Sets

The BCM will not attempt to illuminate the LED indicator lamps when a short circuit to ground is detected.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

CONTROL MODULE REFERENCES for scan tool information

1. NOTE: Each component on backlighting control circuit may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify the following: All backlighting components that the vehicle is equipped with Component locations on the backlighting dimming control circuit Each component's control and ground circuit terminals Ignition OFF, disconnect the harness connector at any component on the interior backlighting control circuit.
2. Scan tool disconnected, interior lamps OFF, doors CLOSED, test for less that 10 ohms between the ground circuit terminal and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the control circuit terminal and ground.
5. Ignition ON, command the LED Backlight Dimming ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
7. 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 BCM.
8. If all circuits test normal, test or replace the appropriate component.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2645 03

Ambient Light Sensor Circuit Low Voltage

DTC B2645 07

Ambient Light Sensor Circuit High Voltage

Ignition ON

B2645 03

The BCM detects a short to ground on the ambient light sensor signal circuit.

B2645 07

The BCM detects greater than 5 volts on the ambient light sensor signal circuit.

The automatic headlamps will malfunction.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES

1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.
2. Test for less than 30 ohms between the low reference circuit terminal 6 and ground.
3. If greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the K33 HVAC Control Module.
4. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 5 and ground.
5. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
6. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
7. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2652 02

Passenger Compartment Dimming 3 Circuit Short to Ground

1. The ignition is ON.
2. The headlamps or park lamps ON.

The BCM detects a short to ground on the accent lighting control circuit.

The BCM does not attempt to illuminate the accent lighting.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connectors at the appropriate E1 accent light.
2. Test for less than 5 ohms between the ground circuit terminal and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition OFF, doors closed, wait 20 seconds before testing for less than 0.3 V between the control circuit terminal and ground.
5. If greater than the specified value, test the circuit for a short to voltage. If the circuits test normal, replace the K9 BCM.
6. Ignition ON, doors open, test for greater than 11 V between the control circuit terminal and ground.
7. If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 BCM.
8. If all circuits test normal, test or replace the E1 accent light.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2657 02

Ignition Switch Halo Lamp Circuit Short to Ground

1. The ignition is ON.
2. The headlamps or park lamps are ON.

The BCM detects a short to ground on the ignition switch halo lamp control circuit.

The BCM will not illuminate the ignition switch halo lamp.

1. The condition responsible for setting the DTC no longer exists.
2. A history DTC will clear once 100 consecutive malfunction ignition cycles have occurred.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the S38 ignition mode switch.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the ground circuit terminal 4 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the control circuit terminal 8 and the ground circuit terminal 4.
5. Command the LED Backlighting ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
7. 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 BCM.
8. If all circuits test normal, test or replace the S38 ignition mode switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B2740 00

Front Fog Lamp Switch Circuit Malfunction

1. The ignition is turned ON.
2. Front fog lamp switch activated.

The BCM detects the fog lamp switch is continuously active.

Front fog lamps will be continuously illuminated.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

The condition for setting the DTC is not longer present.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
2. Ignition ON, test for greater than 10V between the 12 V reference circuit terminal 1 and ground.
3. If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
4. Test for 0.4K ohms to 1K ohms between the signal circuit terminal 12 and ground.
5. If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
6. If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
7. If all circuits test normal, test or replace the S30 headlamp switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3410 01

Automatic Headlamp Leveling Control Module Front Axle Sensor Signal Circuit Short to Battery

DTC B3410 06

Automatic Headlamp Leveling Control Module Front Axle Sensor Signal Circuit Low Voltage/Open

DTC B3420 01

Automatic Headlamp Leveling Control Module Rear Axle Sensor Signal Circuit Short to Battery

DTC B3420 06

Automatic Headlamp Leveling Control Module Rear Axle Sensor Signal Circuit Low Voltage/Open

1. Battery voltage must be between 9-16 V.
2. The ignition is in the ON or RUN position.
3. The headlamps are ON.

B3410 01 or B3420 01

The headlamp leveling control module detects a short to battery on the sensor signal line.

B3410 06 or B3420 06

The headlamp leveling control module detects a short to ground or an open/high resistance on the sensor signal line.

1. The headlamp control module disables the headlamp leveling system.
2. The driver information center will display Service AFL Lamp message.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the appropriate B51 headlamp leveling sensor.
2. Test for less than 5 ohms between the low reference circuit terminal 3 and ground.
3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.
4. Ignition ON, test for 4.8-5.2 V between the 5V reference circuit terminal 1 and ground.
5. If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.
6. If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K28 headlamp leveling control module.
7. Verify the appropriate scan tool Leveling Position Sensor parameter is 0 V.
8. If greater than the specified range, test the signal circuit pin 2 for a short to voltage. If the circuit tests normal, replace the K28 headlamp leveling control module.
9. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5V reference circuit terminal 1. Verify the appropriate scan tool Leveling Position Sensor parameter is greater than 5 V.
10. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.
11. If all circuits test normal, replace the B51 headlamp leveling sensor.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3415 01

Automatic Headlamp Leveling Control Module Axle Sensor Supply Circuit Short to Battery

DTC B3415 02

Automatic Headlamp Leveling Control Module Axle Sensor Supply Circuit Short to Ground

1. Battery voltage must be between 9-16 V.
2. The ignition is in the ON or RUN position.
3. The headlamps are ON.

B3415 01

The headlamp leveling control module detects a short to voltage on the sensor signal line.

B3415 02

The headlamp leveling control module detects a short to ground or an open/high resistance on the sensor signal line.

1. The headlamp control module disables the headlamp leveling system.
2. The driver information center will display Service AFL Lamp message.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the appropriate B51 headlamp leveling sensor.
2. Test for less than 5 ohms between the low reference circuit terminal 3 and ground.
3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.
4. Ignition ON, test for 4.8-5.2 V between the 5V reference circuit terminal 1 and ground.
5. If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.
6. If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the K28 headlamp leveling control module.
7. Verify the appropriate scan tool Leveling Position Sensor parameter is 0 V.
8. If greater than the specified range, test the signal circuit pin 2 for a short to voltage. If the circuit tests normal, replace the K28 headlamp leveling control module.
9. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the 5V reference circuit terminal 1. Verify the appropriate scan tool Leveling Position Sensor parameter is greater than 5 V.
10. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.
11. If all circuits test normal, replace the B51 headlamp leveling sensor.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3588 00

Rear Fog Lamp Switch Circuit Malfunction

1. The ignition is turned ON.
2. Low beam or front fog lamps illuminated.
3. Rear fog lamp switch activated.

Rear fog lamp switch stuck.

1. All cluster/backlighting defaults full bright
2. Steering wheel cluster/backlighting dimming controls inoperative
3. Front fog lamps are inoperative
4. Rear fog lamps are inoperative

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 40 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
2. Ignition OFF, test for 0.4k ohms to 1 ohms between the signal circuit terminal 12 and ground.
3. If greater than the specified value, test the low reference circuit for an short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
4. If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
5. Test for greater than 10 V between the 12 V reference circuit terminal 1 and ground.
6. If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
7. If all circuits test normal, replace the K9 BCM.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3596 00

Hazard Lamps Request Circuit

Ignition is ON

The BCM detects a short to ground on the hazard switch signal circuit for greater than 1 min

The hazard lamps will continuously function.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the P17 info display module.
2. Ignition ON, test for greater than 10V between the signal circuit terminal 16 and ground.
3. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
4. If all circuits test normal, replace the P17 info display module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B364A 00

Surveillance Mode Switch Circuit Malfunction

1. The ignition is turned ON.
2. Front fog lamp switch activated.

Front Fog Lamps Malfunction

Front fog lamp switch stuck

The condition for setting the DTC is not longer present.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 and X3 harness connector at the K9 Body Control Module.
2. Ignition ON, test for less than 0.3 V at the K9 Body Control Module signal circuit harness terminal 9 X1 and ground.
3. If greater then the specified value, test the signal circuit for an short to voltage.
4. Test for less than 0.3 V at the K9 Body Control Module 12 V reference circuit harness terminal 4 X3 and ground.
5. If greater than the specified value, test the 12 V reference circuit for a short to voltage.
6. Ignition OFF, test for infinite resistance between the K9 Body Control Module signal circuit harness terminal 9 X1 and ground.
7. If lower than the specified value, test the signal circuit for a short to ground.
8. Test for infinite resistance between the K9 Body Control Module 12 V reference circuit harness terminal 4 X3 and ground.
9. If lower than the specified value, test the 12 V reference circuit for a short to ground.
10. Press and hold the front fog lamp switch button.
11. Test for 2.6-3.2 kohms between the K9 Body Control Module 12 V reference circuit harness connector X3 terminal 4 and the K9 Body Control Module signal circuit harness terminal 9 X1.
12. If not within the specified range, test the 12 V reference circuit and the signal circuit for an open/high resistance. If the circuits test normal, replace the S30 Headlamp Switch.
13. If all circuits test normal, replace the K9 Body Control Module.

Static Test

Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch. Press and hold the front fog lamp switch button, test for 2.6-3.2 kohmsat the S30 Headlamp Switch terminal 1 and terminal 12.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3650 08

High Beam Request Signal Circuit Performance - Signal Invalid

Battery voltage must be between 9-16 V.

The BCM detects a short to ground in the headlamp high beam signal circuit.

The high beam headlamps will malfunction.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect at the S78 turn signal/multifunction switch.
2. Ignition ON, verify that the scan tool High Beam Select Switch parameter is Inactive.
3. If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K9 BCM.
4. Connect a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify that the scan tool High Beam Select Switch parameter is Active.
5. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
6. If all circuits test normal, test or replace the S78 turn signal/multifunction switch.

Turn Signal/Multifunction Switch Test

1. Ignition OFF, disconnect the harness connector at the S78 turn signal/multifunction switch.
2. Test for Infinite resistance between the terminals listed below with the switch in the open position. Signal terminal 2 and ground terminal 3 Signal terminal 4 and ground terminal 3
3. If not the specified value, replace the S78 turn signal/multifunction switch.
4. Test for less than 2 ohms between the signal terminal 2 and the ground terminal 3 with the switch in the high beam position.
5. If greater than the specified value, replace the S78 turn signal/multifunction switch.
6. Test for less than 2 ohms between the signal terminal 4 and the ground terminal 3 while holding the switch in the flash to pass position.
7. If greater than the specified value, replace the S78 turn signal/multifunction switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3806 00

High Beam and Headlamp Flash Select Circuit Malfunction

Battery voltage must be between 9-16 V.

The BCM detects a short to ground in the headlamp flash to pass signal circuit for greater than 15 seconds.

The high beam headlamps will malfunction.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect at the S78 turn signal/multifunction switch.
2. Ignition ON, verify that the scan tool Headlamps Flash Switch parameter is Inactive.
3. If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 BCM.
4. Connect a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify that the scan tool Headlamps Flash Switch parameter is Active.
5. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
6. If all circuits test normal, test or replace the S78 turn signal/multifunction switch.

1. Ignition OFF, disconnect the harness connector at the S78 turn signal/multifunction switch.
2. Test for Infinite resistance between the terminals listed below with the switch in the open position. Signal terminal 2 and ground terminal 3 Signal terminal 4 and ground terminal 3
3. If not the specified value, replace the S78 turn signal/multifunction switch.
4. Test for less than 2 ohms between the signal terminal 2 and the ground terminal 3 with the switch in the high beam position.
5. If greater than the specified value, replace the S78 turn signal/multifunction switch.
6. Test for less than 2 ohms between the signal terminal 4 and the ground terminal 3 while holding the switch in the flash to pass position.
7. If greater than the specified value, replace the S78 turn signal/multifunction switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3881 02

Tail Lamp Circuit Short to Ground

DTC B3881 04

Tail Lamp Circuit Open

DTC B3882 02

Right Tail Lamp Circuit Short to Ground

DTC B3882 04

Right Tail Lamp Circuit Open

Brake pedal is applied.

B3881 01

The BCM detects a short to voltage on the left rear brake lamp control circuit.

B3881 02

The BCM detects a short to ground on the left rear brake lamp control circuit.

B3882 01

The BCM detects a short to voltage on the right rear brake lamp control circuit.

B3882 02

The BCM detects a short to ground on the right rear brake lamp control circuit.

The appropriate brake lamp will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the appropriate E5 tail lamp.
2. Test for less than 30 ohms between the ground circuit terminal C and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance
4. Connect a test lamp between the control circuit terminal A and ground
5. Ignition ON, command the Brake Lamp ON and OFF with a scan tool, the test lamp should turn ON and OFF when changing between the commanded states.
6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
7. 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 BCM.
8. If all circuits test normal, test or replace the E5 tail lamp.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3883 02

License Plate Lamp Circuit Short to Ground

DTC B3883 04

License Plate Lamp Circuit Open

Headlamp switch in park or low beam position.

B3883 02

The BCM detects a short to ground on the license plate lamp control circuit.

B3883 04

The BCM detects an open/high resistance on the license plate lamp control circuit.

The license plate lamps will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X902 inline harness connector.
2. Test for less than 10 ohms between the ground circuit terminal 15 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the control circuit terminal 1 and ground.
5. Ignition ON, command the License Plate Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the selected states.
6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
7. 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 BCM.
8. If all circuits test normal, test or replace the E7L license plate lamp-left or E7R license plate lamp-right.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3884 02

Center High Mounted Brake Lamp Circuit Short to Ground

DTC B3884 04

Center High Mounted Brake Lamp Circuit Open

The brakes are applied.

B3884 02

The BCM detects a short to ground on the center high mounted brake lamp control circuit

B3884 04

The BCM detects an open/high resistance on the center high mounted brake lamp control circuit

The center high mounted brake lamp will not illuminate.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the E6 center high mounted stop lamp.
2. Test for less than 30 ohms between the ground circuit terminal B and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the control circuit terminal A and ground.
5. Ignition ON, command the center high mounted stop lamp ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the selected states.
6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
7. 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 BCM.
8. If all circuits test normal, replace the E6 center high mounted stop lamp.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3885 02

Trailer Left Tail Lamp Circuit Short to Ground

DTC B3885 04

Trailer Left Tail Lamp Circuit Open

DTC B3886 02

Trailer Right Tail Lamp Circuit Short to Ground

DTC B3886 04

Trailer Right Tail Lamp Circuit Open

When the parking lamps are turned on.

B3885 02 or B3886 02

The trailer brake control module detects a short to ground on the appropriate tail lamp control circuit.

B3885 04 or B3886 04

The trailer brake control module detects an open/high resistance in the appropriate tail lamp control circuit.

The appropriate trailer tail lamp will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 40 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the K68 trailer lighting control module.
2. Test for infinite resistance between the control circuit terminal listed below and ground: Right trailer park lamp control terminal 16 Left trailer park lamp control terminal 4
3. If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X88 trailer connector.
4. Test for less than 1 ohms between the control circuit terminals listed below: Control terminal 16 at the K68 trailer lighting control module and control terminal 5 at the X88 trailer connector. Control terminal 4 at the K68 trailer lighting control module and control terminal 7 at the X88 trailer connector.
5. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the X88 trailer connector.
6. If all the circuits test normal, replace the K68 trailer lighting control module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3887 02

Trailer Left Turn Signal Circuit Short to Ground

DTC B3887 04

Trailer Left Turn Signal Circuit Open

DTC B3888 02

Trailer Right Turn Signal Circuit Short to Ground

DTC B3888 04

Trailer Right Turn Signal Circuit Open

When the trailer left turn lamp or right turn lamp is being actively commanded by the trailer brake control module.

B3887 02 or B3888 02

The trailer brake control module detects a short to ground on the appropriate turn signal control circuit.

B3887 04 or B3888 04

The trailer brake control module detects an open/high resistance in the appropriate turn signal control circuit.

The appropriate trailer turn signal lamp will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 40 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the K68 trailer lighting control module.
2. Test for infinite resistance between the control circuit terminal listed below and ground: Right trailer turn signal lamp control terminal 2 Left trailer turn signal lamp control terminal 17
3. If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X88 trailer connector.
4. Test for less than 1 ohms between the control circuit terminals listed below: Control terminal 2 at the K68 trailer lighting control module and control terminal 4 at the X88 trailer connector. Control terminal 17 at the K68 trailer lighting control module and control terminal 1 at the X88 trailer connector.
5. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance.
6. If all the circuits test normal, replace the K68 trailer lighting control module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3889 02

Trailer Brake Lamps Circuit Short to Ground

DTC B3889 04

Trailer Brake Lamps Circuit Open

When the brake pedal is applied.

B3889 02

The trailer brake control module detects a short to ground on the trailer stop lamp control circuit.

B3889 04

The trailer brake control module detects an open/high resistance on the trailer stop lamp control circuit.

The trailer brake lamps will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 40 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the K68 trailer lighting control module.
2. Test for infinite resistance between the control circuit terminal 10 and ground.
3. If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X88 trailer connector.
4. Test for less than 1 ohms between the control circuit terminal 10 at the K68 trailer lighting control module and control circuit terminal 6 at the X88 trailer connector.
5. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the X88 trailer connector.
6. If all the circuits test normal, replace the K68 trailer lighting control module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B388A 01

Trailer Park Lamps Circuit Short to Battery

DTC B388A 02

Trailer Park Lamps Circuit Short to Ground

DTC B388A 04

Trailer Park Lamps Circuit Open

When the trailer park lamp relay is actively being requested by the BCM.

B388A 01

The BCM detects a short to voltage on the park lamp supply voltage/marker lamp supply voltage circuit.

B388A 02

The BCM detects a short to ground on the park lamp supply voltage/marker lamp supply voltage circuit

B388A 04

The BCM detects an open/high resistance on the park lamp supply voltage/marker lamp supply voltage circuit

B388A 01 or B388A 04

The trailer park lamps are inoperative

B388A 02

The trailer park lamps are always ON

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 40 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the trailer park lamp relay.
2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 86 and ground.
3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Connect a test lamp between the control circuit terminal 85 and the B+ circuit terminal 86.
5. Command the Trailer Park Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
6. 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 BCM.
7. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM
8. If all circuits test normal, test or replace the trailer park lamp relay.

1. Ignition OFF, disconnect the trailer park lamp relay.
2. Test for 60-180 ohms between terminals 85 and 86.
3. If not within the specified range, replace the trailer park lamp relay.
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87
5. If not the specified value, replace the trailer park lamp relay.
6. Install a 5 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
7. If greater than the specified range, replace the trailer park lamp relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3890 02

Trailer Backup Lamps Circuit Short to Ground

DTC B3890 04

Trailer Backup Lamps Circuit Open

When the trailer backup lamps are turned on.

B3890 02

The trailer brake control module detects a short to ground on the trailer backup lamp control circuit.

B3890 04

The trailer brake control module detects an open/high resistance on the trailer backup lamp control circuit.

The trailer backup lamps will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 40 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the K68 trailer lighting control module.
2. Test for infinite resistance between the control circuit terminal 7 and ground.
3. If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X88 trailer connector.
4. Test for less than 1 ohms between the control circuit terminal 7 at the K68 trailer lighting control module and control circuit terminal 8 at the X88 trailer connector.
5. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the X88 trailer connector.
6. If all the circuits test normal, replace the K68 trailer lighting control module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3891 02

Trailer Fog Lamps Circuit Short to Ground

DTC B3891 04

Trailer Fog Lamps Circuit Open

When the trailer fog lamps are turned on.

B3891 02

The trailer brake control module detects a short to ground on the trailer fog lamp control circuit.

B3891 04

The trailer brake control module detects an open/high resistance on the trailer fog lamp control circuit.

The trailer fog lamps will be inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 40 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 harness connector at the K68 trailer lighting control module.
2. Test for infinite resistance between the control circuit terminal 8 and ground.
3. If less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X88 trailer connector.
4. Test for less than 1 ohms between the control circuit terminal 8 at the K68 trailer lighting control module and control circuit terminal 2 at the X88 trailer connector.
5. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the X88 trailer connector.
6. If all the circuits test normal, replace the K68 trailer lighting control module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC B3948 02

Left Front Turn Signal Circuit Short to Ground

DTC B3949 02

Right Front Turn Signal Circuit Short to Ground

When the appropriate turn signal is commanded

B3948 02

The BCM detects a short to ground on the left front turn signal control circuit.

B3949 02

The BCM detects a short to ground on the right front turn signal control circuit.

The appropriate turn signal lamp is inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the appropriate turn signal lamp.
2. Test for less than 30 ohms between the ground circuit terminal listed below and ground. E4Y turn signal repeater lamp-left terminal 2 E4Z turn signal repeater lamp-right terminal 2
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Disconnect the inline harness connector at the appropriate E4LF turn signal lamp-front listed below: E4LF turn signal lamp-left front X115 (Without TT6/TT7/TT8) E4LF turn signal lamp-left front X111 (With TT6/TT7/TT8) E4RF turn signal lamp-right front X116 (Without TT6/TT7/TT8) E4RF turn signal lamp-right front X112 (With TT6/TT7/TT8)
5. Connect a test lamp between the control circuit terminal listed below and ground. E4LF turn signal lamp-left front terminal J E4RF turn signal lamp-right front terminal J E4Y turn signal repeater lamp-left terminal 1 E4Z turn signal repeater lamp-right terminal 1
6. Command the appropriate Turn Signal Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
7. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
8. 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 BCM.
9. If all circuits test normal, replace the turn signal lamp.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC B3948 02

Left Front Turn Signal Circuit Short to Ground

DTC B3949 02

Right Front Turn Signal Circuit Short to Ground

DTC B3950 02

Left Rear Turn Signal Circuit Short to Ground

DTC B3951 02

Right Rear Turn Signal Circuit Short to Ground

When the appropriate turn signal is commanded

B3948 02

The BCM detects a short to ground on the left front turn signal control circuit.

B3949 02

The BCM detects a short to ground on the right front turn signal control circuit.

B3950 02

The BCM detects a short to ground on the left rear turn signal control circuit.

B3951 02

The BCM detects a short to ground on the right rear turn signal control circuit.

The appropriate turn signal lamp is inoperative.

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the appropriate turn signal lamp.
2. Test for less than 30 ohms between the ground circuit terminal listed below and ground. E4Y turn signal repeater lamp-left terminal 2 E4Z turn signal repeater lamp-right terminal 2
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Disconnect the inline harness connector at the appropriate E4LF turn signal lamp-front listed below: E4LF turn signal lamp-left front X115 (Without TT6/TT7/TT8) E4LF turn signal lamp-left front X111 (With TT6/TT7/TT8) E4RF turn signal lamp-right front X116 (Without TT6/TT7/TT8) E4RF turn signal lamp-right front X112 (With TT6/TT7/TT8)
5. Connect a test lamp between the control circuit terminal listed below and ground. E4LF turn signal lamp-left front terminal J E4RF turn signal lamp-right front terminal J E4Y turn signal repeater lamp-left terminal 1 E4Z turn signal repeater lamp-right terminal 1
6. Command the appropriate Turn Signal Lamp ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
7. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
8. 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 BCM.
9. If all circuits test normal, replace the turn signal lamp.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC C0277 06

Brake Pedal Position Sensor Circuit Short to Ground or Open

DTC C0277 07

Brake Pedal Position Sensor Circuit High Voltage

DTC C0277 09

Brake Pedal Position Sensor Circuit Too Fast Transitions

DTC C0277 4B

Brake Pedal Position Sensor Circuit Calibration Not Learned

DTC C0890 03

Control Module Voltage Reference Output 3 Circuit Low Voltage

DTC C0890 07

Control Module Voltage Reference Output 3 Circuit High Voltage

1. Battery voltage must be between 9-16 V
2. Brakes applied

C0277 06 or C0890 03

1. The BCM detects a short to ground or an open/high resistance in the brake pedal position sensor signal circuit.
2. The BCM detects a short to ground or an open/high resistance in the brake pedal position sensor 5 V reference circuit.

C0277 07 or C0890 07

1. The BCM detects a short to battery voltage in the brake pedal position sensor signal circuit.
2. The BCM detects an open/high resistance in the brake pedal position sensor low reference circuit.

C0277 09

The BCM detects the brake pedal position sensor signal is changing faster than possible under normal operating conditions.

C0277 4B

The brake pedal position sensor home position is not learned.

Brake lights will malfunction, the shift lock is inoperative, the service park brake system lamp illuminated in IPC, park brake will set but not disengage

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

Diagnostic Aids

C0277 4B

If the DTC is set, recalibrate the brake pedal position sensor.

C0277 09

If the DTC is set, replace the brake pedal position sensor. If the DTC resets, replace the BCM.

CONTROL MODULE REFERENCES for scan tool information

C0277 06, C0277 07, C0890 03, C0890 07

1. Ignition OFF, disconnect the harness connector at the B22 brake pedal position sensor.
2. Ignition OFF, test for less than 60 ohms between the low reference circuit terminal C and ground.
3. If greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.
5. If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
6. If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
7. Verify that the scan tool Brake Pedal Position Sensor parameter is less than 0.3 V.
8. If greater than the specified range, test the signal circuit pin B for a short to voltage. If the circuit tests normal, replace the BCM K9.
9. Connect a 3 A fused jumper wire between the 5 V reference circuit terminal A and the signal circuit terminal B. Verify that the scan tool Brake Pedal Position Sensor parameter is 4.8-5.2 V
10. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
11. If all circuits test normal, test or replace the B22 brake pedal position sensor.

C0277 09

1. Replace the B22 BPP sensor.
2. Perform the BPP sensor recalibration procedure. Refer to «BRAKE PEDAL POSITION SENSOR, CALIBRATION»(ref-652253-S24781064862014082300000) .
3. Operate the vehicle within the Conditions for Running and Setting the DTC and verify the DTC does not reset.
4. If the DTC resets, replace the K9 BCM.

C0277 4B

1. Verify that the DTC sets under the Conditions for Running and Setting.
2. Perform the BPP sensor recalibration procedure. Refer to «BRAKE PEDAL POSITION SENSOR, CALIBRATION»(ref-652253-S24781064862014082300000) .
3. Operate the vehicle within the conditions that the customer experienced and verify the DTC does not reset.
4. If the DTC resets, replace the B22 BPP sensor.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

DTC C0297 02

Brake Applied Output Circuit Short to Ground

The BCM detects a short to ground on the cruise/ETC/TCC brake signal circuit.

The cruise control system is disabled

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X1 (LF1) or X2 (LAU) harness connector at the K20 ECM.
2. Connect a test lamp between the signal circuit terminal listed below and ground: Terminal 57 (LF1) Terminal 52 (LAU)
3. Ignition ON, observe the function of the test lamp while pressing and releasing the brake pedal. The test lamp should turn ON when the brake pedal is pressed and turn OFF when the brake pedal is released.
4. If the test lamp is always ON, test the signal circuit for a short to voltage.
5. If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance.
6. If all circuits test normal, replace the K9 BCM.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the horn system. Refer to «CHECKING AFTERMARKET ACCESSORIES»(ref-652238-S27245169932014082300000) .
2. Inspect for easily accessible or visible system components for obvious damage or conditions which may cause the symptom.
3. Perform the following if a horn buzzes or has a harsh tone. Inspect for debris in the joint where the horn fastens to the vehicle. Test the torque of the horn mounting hardware. The horn mounting hardware should be tightened to a torque of 10 Nm (7 lb ft).

Symptom List

Refer to HORNS MALFUNCTION in order to diagnose the symptom.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

A short to ground in the horn relay control circuit or a short to voltage in the horn control circuit will cause the horns to sound continuously until the horns overheat and become inoperative.

Rotate the steering wheel while pressing the horn pad to identify intermittent and poor connections within the steering column.

If diagnosing a Horn-Poor Tone condition, inspect the following

1. Debris or water in the horn assembly
2. Proper horn mounting hardware torque-Refer to «FASTENER TIGHTENING SPECIFICATIONS»(ref-652253-S00005706662014082300000) .
3. Debris in the joint where the horns attach to the vehicle
4. Debris in direct contact with the horn
5. Vehicle components vibrating while the horn is sounding

CONTROL MODULE REFERENCES for scan tool information

Horn Test

1. Ignition OFF, disconnect the harness connector at the appropriate P12 horn.
2. Install a 15 A fused jumper wire between the control terminal B and 12 V. Install a jumper wire between the ground terminal A and ground. Verify the P12 horn emits a clear and even tone.
3. If the sound emitted is not clear and even, replace the P12 horn.

1. Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to «CHECKING AFTERMARKET ACCESSORIES»(ref-652238-S27245169932014082300000) .
2. Inspect for easily accessible or visible system components for obvious damage or conditions which may cause the symptom.

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «ADAPTIVE FORWARD LIGHTING MALFUNCTION»(ref-652253-S33036596642014082300000)
2. «BACKUP LAMPS MALFUNCTION»(ref-652253-S22083664362014082300000)
3. «COURTESY LAMPS MALFUNCTION»(ref-652253-S34278079622014082300000)
4. «DAYTIME RUNNING LAMPS MALFUNCTION»(ref-652253-S26199499802014082300000)
5. «FRONT FOG LAMPS MALFUNCTION»(ref-652253-S37403836012014082300000)
6. «HAZARD LAMPS MALFUNCTION»(ref-652253-S06011466662014082300000)
7. «HEADLAMPS MALFUNCTION»(ref-652253-S03986651712014082300000)
8. «HEADLAMP LEVELING MALFUNCTION (RPO T84 OR T85)»(ref-652253-S06114619302014082300000) or «HEADLAMP LEVELING MALFUNCTION (RPO TT6, TT7 OR TT8)»(ref-652253-S08722777302014082300000)
9. «HIGH INTENSITY DISCHARGE LAMP MALFUNCTION»(ref-652253-S31541242522014082300000)
10. «INTERIOR ACCENT LIGHTING MALFUNCTION»(ref-652253-S08383384202014082300000)
11. «INTERIOR BACKLIGHTING MALFUNCTION»(ref-652253-S01372688862014082300000)
12. «PARK, LICENSE, AND/OR TAIL LAMPS MALFUNCTION»(ref-652253-S39685426192014082300000)
13. «REAR FOG LAMPS MALFUNCTION»(ref-652253-S07133171972014082300000)
14. «STOP LAMPS MALFUNCTION»(ref-652253-S09863343192014082300000)
15. «TURN SIGNAL LAMPS AND/OR INDICATORS MALFUNCTION»(ref-652253-S12087394232014082300000)

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the inline harness connector listed below: M29L headlamp leveling actuator-left inline harness connector X111 M29R headlamp leveling actuator-right inline harness connector X112
2. Test for less than 30 ohms between the ground circuit terminal A and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Engine running, test for less than 30 ohms between the ground circuit terminal E and ground.
5. If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.
6. Verify that a test lamp illuminates between the control circuit terminal D and ground.
7. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.
8. Test for 4.25 V-5.25 V between the signal circuit terminal M and ground.
9. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K28 headlamp leveling control module.
10. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K28 headlamp leveling control module.
11. If all circuits test normal, test or replace the M29 headlamp leveling actuator

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the X2 harness connector K9 BCM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the X2 harness connector K9 BCM
5. Disconnect the harness connector at the E5A backup lamp listed below: X3 harness connector E5E tail lamp-left (Without T79) X1 harness connector E5E tail lamp-left (With T79) X3 harness connector E5F tail lamp-right (Without T79) X1 harness connector E5F tail lamp-right (With T79)
6. Test for less than 30 ohms between the ground circuit terminal listed below and ground. E5E tail lamp-left (Without T79) ground terminal 2 E5E tail lamp-left (With T79) ground terminal C E5F tail lamp-right (Without T79) ground terminal 2 E5F tail lamp-right (With T79) ground terminal C
7. If greater than the specified range, test the ground circuit for an open/high resistance.
8. Connect a test lamp between the control circuit terminal listed below and ground: E5E tail lamp-left (Without T79) control terminal 1 E5E tail lamp-left (With T79) control terminal D E5F tail lamp-right (Without T79) control terminal 1 E5F tail lamp-right (With T79) control terminal D
9. Engine running, command the Backup Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the selected states.
10. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
11. 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 BCM.
12. If all circuits test normal, test or replace the E5A backup lamp-left and the E5B backup lamp-right.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the P17 info display module.
2. Ignition ON, test for greater than 10V between the signal circuit terminal 16 and ground.
3. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
4. If all circuits test normal, replace the P17 info display module.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

The following symptoms are noticeable signs of bulb failure

1. Flickering light, caused in the early stages of bulb failure.
2. Lights go out, caused when the ballast detects excessive, repetitive bulb re-strike.
3. Color change-The lamp may change to a dim pink glow.
4. Refer to «EXTERIOR LIGHTING SYSTEMS DESCRIPTION AND OPERATION»(ref-652253-S38892213192014082300000) for more information on when to change the HID bulb.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the KR49 headlamp low beam relay.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 30 and ground.
3. If the test lamp illuminates, test the control circuit for a short to voltage.
4. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.
5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance
6. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
7. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
8. Connect a 20 A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30. Verify the E4G headlamp-left low beam and the E4H headlamp-right low beam are activated.
9. If the E4G headlamp-left low beam or the E4H headlamp-right low beam do not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate E4 headlamp-low beam
10. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
11. Ignition ON, command the low beam lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
12. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
13. 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 BCM.
14. If all circuits test normal, test or replace the KR49 headlamp low beam relay.

1. Ignition OFF, disconnect the KR49 headlamp low beam relay.
2. Test for 60-180 ohms between terminals 85 and 86.
3. If not within the specified range, replace the KR49 headlamp low beam relay.
4. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87
5. If not the specified value, replace the KR49 headlamp low beam relay.
6. Install a 15A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
7. If greater than the specified range, replace the KR49 headlamp low beam relay.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 9 and ground.
3. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the harness connector at the S30 headlamp switch and disconnect the inline harness connector listed below: M29L headlamp leveling actuator-left inline harness connector X115 M29R headlamp leveling actuator-right inline harness connector X116
5. Test for less than 30 ohms between the ground circuit terminal E and ground.
6. If greater than the specified range, test the ground circuit for an open/high resistance.
7. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal D and ground.
8. If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
9. Connect a test lamp between the control circuit terminal F and ground.
10. Ignition ON, headlamps ON, command each headlamp level function by using the headlamp leveling switch. The test lamp should illuminate and change intensity while changing between the commanded states.
11. If the test lamp is always OFF, test the control circuit for a short to ground or an open. If the circuit tests normal, test or replace the S30 headlamp switch.
12. If the test lamp is always ON or does not change intensity, test the control circuit for a short to voltage or for high resistance. If the circuit tests normal, test or replace the S30 headlamp switch.
13. If all circuits test normal, replace the M29 headlamp leveling actuator.

Component Testing

1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
2. With the headlamp leveling switch in position 0, test for 2.2-2.4 k ohms between the ignition terminal 9 and control terminal 10.
3. If not within the specified range, replace the S30 headlamp switch.
4. With the headlamp leveling switch in position 1, test for 1.9-2.1 k ohms between the ignition terminal 9 and control terminal 10.
5. If not within the specified range, replace the S30 headlamp switch.
6. With the headlamp leveling switch in position 2, test for 1.7-1.9 k ohms between the ignition terminal 9 and control terminal 10.
7. If not within the specified range, replace the S30 headlamp switch.
8. With the headlamp leveling switch in position 3, test for 1.4-1.6 kohms between the ignition terminal 9 and control terminal 10.
9. If not within the specified range, replace the S30 headlamp switch.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Ignition OFF, disconnect the harness connector at the appropriate E1 accent lamp.
2. Test for less than 5.0 ohms between the ground circuit terminal and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the control circuit terminal and ground.
5. Ignition ON, command the Accent Lighting ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
6. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
7. 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 BCM.
8. If all circuits test normal, replace the E1 accent lamp.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

Dimmer Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the S30 headlamp switch.
2. Test for less that 10 ohms between the ground circuit terminal 6 and ground.
3. If greater than the specified range, test the ground circuit for an open high/resistance.
4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
6. Ignition ON, test for less than 0.3 V between signal circuit terminal 12 and ground.
7. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
8. Install a 3 A fused jumper wire between the signal circuit terminal 12 and the B+ circuit terminal 1. The interior backlighting should be dimmed.
9. If the interior backlighting is not dimmed, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
10. If all circuits test normal, test or replace the S30 headlamp switch.

Interior Backlighting Circuit Test

1. Ignition OFF, disconnect the harness connector at the appropriate backlighting component.
2. Test for less than 5.0 ohms between the ground circuit terminal and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Connect a test lamp between the control circuit terminal and ground.
5. Ignition ON, command the LED Backlight Dimming ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
6. 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 BCM.
7. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
8. If all circuits test normal, test or replace the component with the inoperative backlighting.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) prior to using this diagnostic procedure.
2. Review «STRATEGY BASED DIAGNOSTICS»(ref-652232-S31928919322014082300000) for an overview of the diagnostic approach.
3. «DIAGNOSTIC PROCEDURE INSTRUCTIONS»(ref-652232-S26410554662014082300000) provides an overview of each diagnostic category.

CONTROL MODULE REFERENCES for scan tool information