Manual Temperature Control

B1610 - Ambient Light Sensor Input Circuit Low

For a complete wiring diagram, refer to.

• When Monitored: With the ignition on.

• Set Condition: If the ambient light sensor input is out of range toward the low voltage threshold.






• This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored.

Test Step 1 - Check for an Active DTC 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 Test Step 2 => [ Test Step 2 - Check Auto Headlamps Signal Circuit for a Short to
Ground ]

No

• Replace the sun sensor.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 2 - Check Auto Headlamps Signal Circuit for a Short to Ground

• Turn the ignition OFF.

• Disconnect the A/C heater control C1 harness connector.

• Measure the resistance of the auto headlamps signal circuit between ground and the A/C heater control C1 harness connector.

Is the resistance less than 10k ohms?

Yes

• Repair the auto headlamps signal circuit for a short to ground.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Go to Test Step 3 => [ Test Step 3 - Check Auto Headlamps Signal Circuit for a Short to
Sensor Ground Circuit ]

Test Step 3 - Check Auto Headlamps Signal Circuit for a Short to Sensor Ground Circuit

• Measure the resistance between the auto headlamps signal circuit and the sensor ground circuit in the A/C heater control C1 harness connector.

Is the resistance less than 10k ohms?

Yes

• Repair the auto headlamps signal circuit for a short to the sensor ground circuit.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Replace the A/C heater control.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test