Pinpoint Test

CHECK THE FLM HEADLAMP SWITCH PIDs
NOTE: Make sure the headlamp switch is aligned in the correct position when monitoring the PIDs .
1. Ignition ON.
2. Using a scan tool, view FLM PIDs .
3. Using a scan tool, monitor the FLM LT_SW PID while moving the headlamp switch through all positions.
Do the headlamp switch positions agree with the PID?
- Yes: GO to 2 .
- No: INSTALL a new FLM. REFER to Front Lighting Control Module (FLM) .
USE THE RECORDED DTCs FROM THE BCM SELF-TEST
1. Check the recorded results from the BCM self-test.
Is DTC B1A85:13 or DTC B1A85:11 present?
- Yes: For DTC B1A85:13, GO to 4.
  For DTC B1A85:11, GO to 6.
- No: GO to 3 .

CHECK FOR VOLTAGE TO THE LIGHT SENSOR (NO DTC)

Ignition OFF.
Disconnect: Light Sensor.
Ignition ON.
Place the headlamp switch in the autolamps on position.

Measure:

Light Sensor			Ground

C286			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	VLF14 (BU/BN)		-	Ground

Is the voltage approximately 5 volts?

Yes: INSTALL a new light sensor. REFER to Light Sensor .
No: GO to 10.

CHECK FOR VOLTAGE TO THE LIGHT SENSOR (DTC B1A85:13)

Ignition OFF.
Disconnect: Light Sensor.
Ignition ON.
Place the headlamp switch in the autolamps on position.

Measure:

Light Sensor			Ground

C286			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	VLF14 (BU/BN)		-	Ground

Is the voltage approximately 5 volts?

Yes: GO to 7.
No: GO to 5 .

CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.
Disconnect: BCM C2280B.
Ignition ON.

Measure:

Light Sensor			Ground

C286			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	VLF14 (BU/BN)		-	Ground

Is any voltage present?

Yes: REPAIR the circuit.
No: GO to 6 .

CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Light Sensor			BCM

C286			C2280B
Pin	Circuit	Measurement / Action	Pin	Circuit
2	VLF14 (BU/BN)		30	VLF14 (BU/BN)

Is the resistance less than 3 ohms?

Yes: GO to 10.
No: REPAIR the circuit.

CHECK THE LIGHT SENSOR GROUND CIRCUIT FOR AN OPEN

Measure:

Light Sensor			Light Sensor

C286			C286
Pin	Circuit	Measurement / Action	Pin	Circuit
2	VLF14 (BU/BN)		4	GD215 (BK/GY)

Is the voltage approximately 5 volts?

Yes: INSTALL a new light sensor. REFER to Light Sensor .
No: REPAIR the circuit.

CHECK FOR VOLTAGE TO THE LIGHT SENSOR (DTC B1A85:11)

Ignition OFF.
Disconnect: Light Sensor.
Ignition ON.
Place the headlamp switch in the autolamps on position.

Measure:

Light Sensor			Ground

C286			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	VLF14 (BU/BN)		-	Ground

Is the voltage approximately 5 volts?

Yes: INSTALL a new light sensor. REFER to Light Sensor .
No: GO to 9 .

CHECK THE LIGHT SENSOR INPUT CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.
Disconnect: BCM C2280B.

Measure:

Light Sensor			Ground

C286			Ground
Pin	Circuit	Measurement / Action	Pin	Circuit
2	VLF14 (BU/BN)		-	Ground

Is the resistance greater than 10, 000 ohms?

Yes: GO to 10 .
No: REPAIR the circuit.

CHECK FOR CORRECT BCM OPERATION
1. Disconnect and inspect all BCM connectors.
2. Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged or bent pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
3. Reconnect the BCM connectors. Make sure they seat and latch correctly.
4. Operate the system and determine if the concern is still present.
Is the concern still present?
- Yes: CHECK OASIS for any applicable TSBs . If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, Install a new BCM. REFER to BODY CONTROL MODULE (BCM) - WITHOUT INTELLIGENT ACCESS (IA) , or REFER to BODY CONTROL MODULE (BCM) - WITH INTELLIGENT ACCESS (IA) .
- No: The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.