Brake Warning Indicator: Testing and Inspection

Fig. 116 Brake Warning System Wiring Circuit:

The solid state switch in instrument cluster closes when sensor input is 0 volts. Sensor input is 0 volts if brake pad wear sensor grounds against the brake rotor or the brake pad wear sensor circuit is open.

Note! Voltage at brake wear sensor connector is within 1 volt of battery voltage.

Condition: Brake Pad Wear indicator stays ON after start-up bulb check sequence or intermittently illuminates during brake application.

1 Turn ignition switch on.

2 Check for voltage at LH brake pad sensor connector:
No volts: check for an open circuit between I/P connector C1, pin 15, and brake sensor connector.

3 Check LH brake pad sensor for continuity and wear:
No continuity: replace sensor.
Wear: If pad sensor is worn to the point that the wire running through the sensor is exposed, replace sensor.

4 Check for voltage at RH brake pad sensor connector:
No volts: check for an open circuit between the LH sensor connector and the RH sensor connector.

5 Check RH brake pad sensor for continuity and wear:
No continuity: replace sensor.
Wear: If pad sensor is worn to the point that the wire running through the sensor is exposed, replace sensor.

6 Check voltage at I/P connector C2 pin 8:
No volts: check for open circuit between I/P connector C2, pin 8, and the RH brake pad sensor connector.

7 If brake pad sensor circuit is OK yet the Brake Lining Wear Indicator is still ON, the fault exists in the I/P Cluster.