Antilock Braking System (ABS)

Circuit Description

A DTC 37 relates to the BPMV seeing the rear speed signal line drop out and return. This DTC can be caused by a malfunction in the VSS, VSS buffer, or CKT 696. Do not replace the BPMV for this DTC. A faulty BPMV will not cause this DTC to set.

Test Description

- Check it all systems are receiving an erratic speed signal or if it is just the 4WAL system.
- Check the VSS output using the Tech 1
- Check the resistance of the VSS.
- Check for an open condition in CKT 822.
- Check for excessive resistance in CKT 696.
- Measure voltage at BPMV 10-way connector pins E and J.

Diagnostic Aids

Do not replace the BPMV for this DTC. A faulty BPMV will not cause this DTC to set.

If the voltage readings are low or varying, the battery, charging system, or intermittent connections could be the cause. Check these areas before replacing any components.

Do not pierce the electrical connectors, wires, seals, or insulation during testing. Doing so will break the seal and lead to corrosion and failure of the wiring and terminals.