ATC

B1611-AMBIENT LIGHT SENSOR INPUT CIRCUIT LOW (ATC)

For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .


- When Monitored:
With the ignition on.

- Set Condition:
If the Ambient Light Sensor input is out of range toward the high voltage threshold.







NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test (ATC) for stored DTC test procedures. Heating-A/C System Diagnostics


Diagnostic Test


1. CHECK FOR DTC B1610-AMBIENT LIGHT SENSOR INPUT CIRCUIT LOW WITH SUN SENSOR HARNESS CONNECTOR DISCONNECTED
Turn the ignition off.
Disconnect the Sun Sensor harness connector.
Turn the ignition on.
With the scan tool, erase HVAC DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
With the scan tool, read HVAC DTCs.
Does the scan tool display this DTC as active?

Yes


- Go To 2


No


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


2. CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Measure the voltage of the (L24) Auto Headlamps Signal circuit between ground and the A/C Heater Control C1 harness connector.
Is the voltage below 0.2 volts?

Yes


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


No


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