B2646

DTC B2646

CIRCUIT DESCRIPTION
The sunload sensor assembly is a light sensitive photocell. The instrument panel module (IPM) determines the ambient light based on the voltage from the sunload sensor assembly. The IPM controls the head lamp automatic on/off and delayed off functions.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B2646 Ambient Light Sensor Circuit Range/Performance

CONDITIONS FOR RUNNING THE DTC
The IPM is powered.

CONDITIONS FOR SETTING THE DTC
The sunload sensor assembly voltage is less than 0.09 or greater than 4.80 volts.

ACTION TAKEN WHEN THE DTC SETS
- Sets the variable ambient light status to DARK.
- The IPM sets a DTC.

CONDITIONS FOR CLEARING THE DTC
The IPM does not detect a voltage that is less than or greater than the predetermined value during the diagnostic self test.

TEST DESCRIPTION

Steps 1 - 11:

Step 12:

The numbers below refer to the step numbers on the diagnostic table.
3. Tests for the proper operation of the circuit in the high voltage range.
4. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.