P1805

P1805 BRAKE SWITCH

Description
Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed. This signal is used mainly to decrease the engine speed when the vehicle is driving.

Consult-II Reference Value In Data Monitor Mode:

On Board Diagnosis Logic
Malfunction is detected when a brake switch signal is not sent to ECM for an extremely long time while the vehicle is driving.

Possible Cause
- Harness or connectors
(Stop lamp switch circuit is open or shorted.)
- Stop lamp switch

DTC Confirmation Procedure
With CONSULT-II
1. Turn ignition switch "ON".
2. Fully depress the brake pedal for at least 5 seconds.
3. Erase the DTC with CONSULT-II.




4. Select "DATA MONITOR" mode with CONSULT-II.
5. If 1st trip DTC is detected, go to "Diagnostic Procedure".

With GST
Follow the procedure "WITH CONSULT-II" above.

EC-BRK/SW-01:

Wiring Diagram

Step 1 - 2:

Step 3 - 7:

Diagnostic Procedure

Component Inspection

STOP LAMP SWITCH




1. Disconnect stop lamp switch harness connector.







2. Check continuity between stop lamp switch terminals 1 and 2 under the following conditions.
3. If NG, replace stop lamp switch.