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Pinpoint Test M : B135C:11, B135C:15: Notes

Refer to Adjustable Steering Column for schematic and connector information.

Normal Operation and Fault Conditions 

When steering wheel heat is requested, the HSWM applies voltage and ground to the steering wheel heating element (integral to the steering wheel). The steering wheel heating element draws between 1 and 10 amps of current depending on steering wheel temperature. The HSWM uses a sensor in the steering wheel (integral to the steering wheel) to maintain the heated steering wheel temperature. The HSWM is designed to remain on, heating the steering wheel and maintaining temperature until switched OFF on the FDIM or until the ignition is turned OFF.

HSWM DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
B135C:11 Heater Element: Circuit Short to Ground This DTC sets when the heated steering wheel is commanded on and the HSWM senses current greater than 10 amps on the steering wheel heating element output circuit for greater than 80 ms, indicating a short to ground. This DTC also sets when the steering wheel heating element output Field Effect Transistor (FET) in the HSWM has a thermal failure. When this fault sets, the steering wheel heating element output is disabled until the ignition is cycled.
B135C:15 Heater Element: Circuit Short to Battery or Open This DTC sets when the heated steering wheel is commanded on and the module senses current less than 1 amp on the steering wheel heating element output circuit for more than 80 ms. This indicates a short to voltage, an open circuit or an open circuit in the heating element. When this fault sets, the steering wheel heating element output is disabled until the ignition is cycled.

Possible Causes 

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