B160F

B160F-AMBIENT LIGHT SENSOR 1 INPUT CIRCUIT PERFORMANCE





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

- Set Condition:
If the Ambient Light Sensor input is out of range.





Diagnostic Test

1. ACTIVE DTC(S) PRESENT
Turn the ignition on.
With the scan tool, check for DTCs.
Does the scan tool display this DTC as active?

Yes

- Go to 2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

2. CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR AN OPEN




Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Disconnect the Sunload Sensor harness connector.
Measure the resistance of the (L24) Auto Headlamps Signal circuit between the Sunload Sensor harness connector and the A/C Heater Control C1 harness connector.
Does the ohm meter read open circuit?

Yes

- Repair the (L24) Auto Headlamps Signal circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go to 3

3. CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR A SHORT TO GROUND




Measure the resistance between ground and the (L24) Auto Headlamps Signal circuit in the A/C Heater Control C1 harness connector.
Does the ohm meter read open circuit?

Yes

- Go to 4

No

- Repair the (L24) Auto Headlamps Signal circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

4. CHECK (G939) SENSOR RETURN CIRCUIT FOR AN OPEN




Measure the resistance of the (G939) Sensor Return circuit between the Sunload Sensor harness connector and the A/C Heater Control C1 harness connector.
Does the ohm meter read open circuit?

Yes

- Repair the (G939) Sensor Return circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go to 5

5. CHECK THE SUNLOAD SENSOR
Reconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Using the scan tool, observe the Auto Headlamp signal while connecting a jumper wire between the (L24) Auto Headlamps Signal circuit and the (G939) Sensor Return circuit in the Sunload Sensor harness connector.
Does the Auto Headlamp signal change from approximately 5 volts to 0 volts?

Yes

- Replace the Sunload Sensor.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Replace the A/C Heater Control.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.