VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC C0054 BLS OFF MALFUNCTION

DTC DETECTING CONDITION:

Defective stop light switch

TROUBLE SYMPTOM:

• ABS does not operate.

• VDC does not operate.

WIRING DIAGRAM:

STEPCHECKYESNO

1.CHECK STOP LIGHT SWITCH.

1) Turn the ignition switch to OFF.

2) Disconnect the stop light switch connector.

3) Measure the resistance of stop light switch terminals.

Is the resistance 0.5 Ω or less when the switch is ON (when pedal is depressed)?

Replace the stop light switch.

2.CHECK STOP LIGHT POWER SUPPLY.

Measure the voltage between stop light switch terminal and chassis ground.

Connector & terminal

Model without cruise control

(B64) No. 1 (+) — Chassis ground (−):

Model with cruise control

(B65) No. 2 (+) — Chassis ground (−):

Is the voltage 10 — 15 V?

Repair the stop light power supply circuit.

3.CHECK STOP LIGHT SWITCH HARNESS.

1) Disconnect the connector from the VDCCM&H/U.

2) Measure the resistance between VDCCM&H/U and stop light switch.

Connector & terminal

Model without cruise control

(B64) No. 2 — (B310) No. 30:

Model with cruise control

(B65) No. 3 — (B310) No. 30:

Is the resistance less than 0.5 Ω?

Repair the stop light switch circuit.

4.CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of connector between stop light switch and VDCCM&H/U?

Repair the connector.

5.CHECK VDCCM&H/U.

1) Connect all connectors.

2) Clear the memory.

3) Perform the Inspection Mode.

4) Read the DTC.

Is the same DTC displayed?

Replace the VDCCM only.

6.CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diagnosis according to DTC.

Temporary poor contact occurs.