SAAB WIS ONLINE

BRAKE WARNING LIGHT DOES NOT GO OFF

BRAKE WARNING LIGHT DOES NOT GO OFF

DETECTING CONDITION:


• Brake warning light circuit is shorted.

• Defective sensor/connector


TROUBLE SYMPTOM:

After starting the engine, the brake warning light is kept on though the parking lever is released.

WIRING DIAGRAM:


CHECK INSTALLATION OF ABSCM&H/U CONNECTOR.

Turn the ignition switch to OFF.

Check that the ABSCM&H/U connector is inserted to ABSCM&H/U until the clamp locks onto it.

Is the connector correctly inserted?

Yes


No

Insert the ABSCM&H/U connector until the clamp locks onto it.


READ DTC.

Read the DTC.

Is DTC displayed?

Yes

Perform the diagnosis according to DTC.


No


CHECK THE BRAKE FLUID AMOUNT.

Check the amount of brake fluid in the reservoir tank of master cylinder.

Is the amount of brake fluid between the lines of MAX and MIN?

Yes


No

Replenish brake fluid to the specified value.


CHECK BRAKE FLUID LEVEL SWITCH.

Disconnect the level switch connector (B16) from master cylinder.

Measure the resistance of brake fluid switch terminals.

Terminals

No. 1 — No. 2:

Is the resistance more than 1 MΩ?

Yes


No

Replace the master cylinder.


CHECK PARKING BRAKE SWITCH.

Disconnect the connector (R4) from parking brake switch.

Release the parking brake.

Measure the resistance between parking brake switch terminal and chassis ground.

Is the resistance more than 1 MΩ?

Yes


No

Replace the parking brake switch.


CHECK GROUND SHORT OF HARNESS.

Disconnect the connector (i10) from combination meter.

Measure the resistance between combination meter connector and chassis ground.

Connector & terminal

(i10) No. 19 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes


No

Repair the harness connector between combination meter and parking brake switch.


CHECK HARNESS.

Disconnect the connector (B301) from ABSCM&H/U.

Disconnect the connector (i10) from the combination meter.

Measure the resistance between ABSCM&H/U connector and combination meter connector.

Connector & terminal

(B301) No. 8 — (i10) No. 1:

Is the resistance less than 0.5 Ω?

Yes


No

Repair harness between ABSCM&H/U and combination meter connector.


CHECK POOR CONTACT IN CONNECTOR.

Check poor contact in all connectors.

Is there poor contact?

Yes

Repair the connector.


No


CHECK ABSCM.

Connect the connector to the ABSCM&H/U.

Turn the ignition switch to ON.

Measure the resistance between combination meter connector and chassis ground.

Connector & terminal

(i10) No. 1 — Chassis ground:

Is the resistance less than 0.5 Ω?

Yes

Check the combination meter.


No

Replace the ABSCM only.