A037

Fig. 482 Code 37: High System Voltage:

DTC A036 & DTC A037 System Voltage:

Circuit Description:
This DTC is designed to detect high vehicle voltage levels prior to any required motor movement (initialization or ABS operation). If excessive voltage exists, demagnetization of the motor magnets may occur, which would eventually affect or eliminate ABS performance.

Failure Condition:
DTC AO37 can only be set if the vehicle's speed is greater then 8 km/h (5 mph). If the switched battery voltage is greater than 17 volts, a malfunction exists.

Action Taken:
A DTC A037 is stored, ABS is disabled and the "ABS" indicator lamps is turned on.

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step checks the voltage level being received by the EBCM.
2. This step indicates whether the high voltage condition is caused by a malfunctioning charging system or EBCM.

Diagnostic Aids:
An "intermittent" malfunction may be caused by a poor connection, rubbed through wire insulation or a wire that is broken inside the insulation.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the TECH 1.

Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.