Pinpoint Tests: Notes

Pinpoint Test D: DTC B135C:11 or B135C:15 

Normal Operation 

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 will draw between 1 and 10A of current depending on STEERING WHEEL temperature. The STEERING WHEEL contains 3 heating elements wired in parallel and has a resistance of 1.6-2.6 ohms. If the STEERING WHEEL is equipped with wood inserts, the STEERING WHEEL contains 2 heating elements wired in parallel and has a resistance of 2.1-3.1 ohms. The heated STEERING WHEEL temperature is maintained by the HSWM using a sensor in the STEERING WHEEL (integral to the STEERING WHEEL). The HSWM is designed to remain on, heating the STEERING WHEEL and maintaining temperature until switched OFF on the FDIM or the ignition is turned OFF.

• DTC B135C:11 (Heater Element: Circuit Short to Ground) -- This DTC will only set when the heated STEERING WHEEL is commanded on. The module senses current greater than 10A on the STEERING WHEEL heating element output circuit for greater than 80ms, indicating a short to ground, this DTC sets. This DTC also sets when the STEERING WHEEL heating element output FET in the module has a thermal failure. The STEERING WHEEL heating element output will be disabled until the ignition is cycled.
• DTC B135C:15 (Heater Element: Circuit Short to Battery or Open) -- This DTC will only set when the heated STEERING WHEEL is commanded on. The module senses current less than 1A on the STEERING WHEEL heating element output circuit for more than 80ms, indicating a short to voltage or an open circuit or heating element. The STEERING WHEEL heating element output will be disabled until the ignition is cycled.

Possible Sources: 

• Wiring, terminals or connectors
• STEERING WHEEL
• Clockspring
• HSWM