B160F-12

B160F-12-TWILIGHT/AMBIENT LIGHT SENSOR INPUT - CIRCUIT SHORT TO BATTERY







- When Monitored:
With the ignition on.

- Set Condition:
If the Twilight Light Sensor input voltage is greater than 4.9 volts for period of 30 seconds.





Always perform the HVAC Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

1. CHECK IF THE DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, read HVAC DTCs.

NOTE: It can take up to 60 seconds or more for this DTC to mature.

Is this DTC active?

Yes

- Go To 2

No

- Go To 6

2. CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the A/C Heater Control C1 harness connector.
3. Ignition on, engine not running.
4. Measure the voltage of the (L24) Auto Headlamps Signal circuit.

Is there any voltage present?

Yes

- Repair the (L24) Auto Headlamps Signal circuit for a short to voltage.
- Perform HVAC VERIFICATION TEST HVAC Verification Test.

No

- Go To 3

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




1. Turn the ignition off to the lock position.
2. Disconnect the Sun Sensor harness connector.
3. Measure the resistance of the (L24) Auto Headlamps Signal circuit between the A/C Heater Control C1 harness connector and the Sun Sensor harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 4

No

- Repair the (L24) Auto Headlamps Signal circuit for an open.
- Perform HVAC VERIFICATION TEST HVAC Verification Test.

4. CHECK (C121) SENSOR GROUND CIRCUIT FOR AN OPEN




1. Measure the resistance of the (C121) Sensor Ground circuit between the A/C Heater Control C1 harness connector and the Sun Sensor harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 5

No

- Repair the (C121) Sensor Ground circuit for an open.
- Perform HVAC VERIFICATION TEST HVAC Verification Test.

5. CHECK THE SUN SENSOR AND A/C HEATER CONTROL
1. Replace the Sun Sensor.
2. Perform HVAC VERIFICATION TEST HVAC Verification Test.

Did this DTC reset while performing the HVAC Verification Test?

Yes

- Replace and program the A/C Heater Control.
- Perform HVAC VERIFICATION TEST HVAC Verification Test.

No

- Test complete.

6. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, partially broken wires.
4. Check the connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
5. Wiggle the wiring and connectors while checking for shorted and open circuits.
6. With the scan tool, check the Environmental Data to help identify the conditions in which the DTC was set.

Were there any problems found?

Yes

- Repair as necessary.
- Perform HVAC VERIFICATION TEST HVAC Verification Test.

No

- Test complete.