B2657

CIRCUIT DESCRIPTION
The HVAC control module (CCP) provides a switched ground to the circuit from the key cylinder halo light. The halo light is supplied voltage at all times. The HVAC control module samples the voltage on the circuit from the halo light to determine the state of the input.

CONDITIONS FOR RUNNING THE DTC
^ The HVAC control module is powered.
^ DTC B1327 is not current.

CONDITIONS FOR SETTING THE DTC
The DTC sets if the HVAC control module senses no voltage on the circuit from the halo light for a period longer than 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
The HVAC control module disables the internal switch that controls the halo light.

CONDITIONS FOR CLEARING THE DTC
The DTC will be cleared from the HVAC control module when it receives a new power mode signal over the class 2 communications system. If the HVAC control module senses no voltage on the halo light circuit the DTC will reset after 2 seconds.

TEST DESCRIPTION

Steps 1-7:

Steps 8-10:

The numbers below refer to the step numbers on the diagnostic table.
2. Observe the key cylinder halo operation.
Command both the ON and OFF states. Repeat the commands as necessary.