Code 158/163 - TCS Motor Circuit Shorted To Battery (W/TCS): Notes

Code 158 - Left Rear
Code 163 - Right Rear

Identifies TCS motor circuit that is shorted to battery or TCS motor that has low or no resistance. This malfunction will not allow TCS motor to be controlled at the commanded current rate or will cause TCS motor to turn in opposite direction, or not turn at all.

Code can be set only when TCS motor is commanded off. A malfunction exists if EBTCM detects an out of range voltage on either TCS motor circuits, indicating a circuit shorted to battery or TCS motor is shorted. When code is stored, TCS is disabled, TCS and BRAKE warning lights are illuminated.

NOTE: Test numbers refer to numbers on diagnostic chart. Use only 10-megohm (minimum) DVOM for all voltage and resistance tests. For identification of circuits and terminals referenced in charts and text, see WIRING DIAGRAMS .

Fig 1: Code 158/163 Diagnostic Flow Chart

Checks for short to voltage in TCS motor high circuit.
Checks for short to voltage in TCS motor low circuit.
Checks for short between the high and low motor circuits.
Checks for an internally shorted TCS motor.
Ensure malfunction was not due to physical damage of circuit.