C0037

DTC C0037 Rear Speed Signal Erratic (4.3L Engines Only):

Vehicle Speed Sensors Schematic:

CIRCUIT DESCRIPTION
The rear wheel speed signal originates from the Vehicle Speed Sensor (VSS) which is connected to the Vehicle Control Module (VCM). The Electronic Brake Control Module (EBCM) receives the rear wheel speed signal from the VCM.

CONDITIONS FOR SETTING DTC
EBCM seeing the rear speed signal line drop out and return. This Diagnostic Trouble Codes (DTC) can be caused by a malfunction in the VSS, or a fault in circuit 821, 822, or 1827.

ACTION TAKEN WHEN THE DTC SETS
^ ANTILOCK indicator lamp is illuminated
^ ABS is disabled

DIAGNOSTIC AIDS
This DTC can be caused by a malfunction in the VSS, or a fault in circuit 821, 822, or 1827.

DTC CHART TEST DESCRIPTION
The numbers below refer to the numbers on the diagnostic chart.
1. Measure the voltage at terminal E of the EBCM.
3. Check for an open in circuit 1827.
5. Check for a short to ground in circuit 1827.