CRUISE CONTROL SYSTEM (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC 12

Detected when the brake pedal is depressed, or malfunction related to the stop light & brake switch occurs.

TROUBLE SYMPTOM:

• Cruise control cannot be set.

• Cruise control cannot be released.

WIRING DIAGRAM:

• LHD model

• RHD model

STEPCHECKYESNO

1.CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT.

1) Turn the ignition switch to OFF.

2) Disconnect the stop light & brake switch harness connector.

3) Turn the ignition switch to ON.

4) Measure the voltage between harness connector terminal and chassis ground.

Connector & terminal

(B65) No. 2 (+) — Chassis ground (−):

Is the voltage 10 V or more?

• Check fuse No. 16 (in fuse & relay box).

• Check for open or short circuit in the harness between stop light & brake switch and fuse & relay box.

2.CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT.

Measure the voltage between harness connector terminal and chassis ground.

Connector & terminal

(B65) No. 1 (+) — Chassis ground (−):

Is the voltage 10 V or more?

• Check fuse No. 18 (in fuse & relay box).

• Check for open or short circuit in the harness between stop light & brake switch and fuse & relay box.

• Check the clutch switch and circuit.

3.CHECK STOP LIGHT & BRAKE SWITCH CIRCUIT.

1) Turn the ignition switch to OFF.

2) Disconnect the harness connector of ECM.

3) Disconnect the harness connector of body integrated unit.

4) Measure the resistance between harness connector terminals of ECM and of body integrated unit, and harness connector terminals of stop light & brake switch.

Connector & terminal

LHD 2.0 L model

(B136) No. 13 — (B65) No. 3:
(B136) No. 12 — (B65) No. 4:

LHD 2.5 L model

(B135) No. 28 — (B65) No. 3:
(B135) No. 20 — (B65) No. 4:

RHD 2.0 L model

(B136) No. 13 — (B65) No. 3:
(B136) No. 12 — (B65) No. 4:

RHD 2.5 L model

(B135) No. 28 — (B65) No. 3:
(B136) No. 25 — (B65) No. 4:

Is the resistance less than 10 Ω?

Repair the harness.

4.CHECK STOP LIGHT & BRAKE SWITCH.

Remove and check the stop light & brake switch.

Is the stop light & brake switch normal?

Stop light & brake switch is normal.

Replace the stop light & brake switch.