B1397
CIRCUIT DESCRIPTIONThe BCM provides an interface to allow control of the power to three resistive ladder networks through rear wiper/washer switch supply voltage circuit. Two resistive ladders are connected to the steering wheel control switches input and one is connected to the rear wiper data input. The wheel control switches can operate the radio and the HVAC blower. The BCM provides an internal 10 volts reference used in three separate ratiometric comparisons to determine which steering wheel control switch and which rear wiper switch, if any, are activated.
CONDITIONS FOR RUNNING THE DTC
The voltage supplied to the body control module is in the range of 7-26 volts.
CONDITIONS FOR SETTING THE DTC
The BCM senses a short to ground in the steering wheel switch, rear wiper/washer switch supply circuit, for more than 1 second.
ACTION TAKEN WHEN THE DTC SETS
The BCM will disable the output for the rest of the ignition cycle. The steering wheel switches don't perform their function and the rear wiper will not work.
CONDITIONS FOR CLEARING THE DTC
^ A current DTC clears when the malfunction is no longer present.
^ A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
DIAGNOSTIC AIDS
An intermittent short to ground in the steering wheel switch, rear wiper/washer switch supply voltage circuit will set the code. Inspect for loose or poor connections at all related components. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.
TEST
