P0703

DTC P0703 - BRAKE SWITCH INPUT MALFUNCTION

DTC DETECTING CONDITION:
- Two consecutive driving cycles with fault

CAUTION: After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE and INSPECTION MODE. Refer to How to Clear Diagnostic Trouble Codes.




WIRING DIAGRAM

11AW1: CHECK OPERATION OF BRAKE LIGHT.

CHECK: Does brake light come on when depressing the brake pedal?

YES: Go to step 11AW2.

NO: Repair or replace brake light circuit.

11AW2: CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.
1. Disconnect connectors from TOM and brake light switch.

Connector & terminal(B55) No.24 - (B64) No.2:(B55) No.24 - (B65) No.3 (With cruise control).:

2. Measure resistance of harness between TCM and brake light switch connector.

CHECK: Is the resistance less than 1 ohm?

YES: Go to step 11AW3.

NO: Repair or replace harness and connector.

NOTE: In this case repair the following:
- Open circuit in harness between TOM and brake light switch connector.
- Poor contact in TCM connector.
- Poor contact in brake light switch connector

11AW3: CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.

Connector & terminal (B55) No.24 - Chassis ground.:

Measure resistance of harness between TOM and chassis ground.

CHECK: Is the resistance more than 1 M.Ohm?

YES: Go to step 11AW4.

NO: Repair ground short circuit in harness between TCM and brake light switch connector.

11AW4: CHECK INPUT SIGNAL FOR TCM.
1. Connect connectors to TOM and brake light switch.

Connector & terminal (B55) No.24 (+) - Chassis ground (-):

2. Measure voltage between TOM and chassis ground.

CHECK: Is the voltage less than 1 Volt when releasing the brake pedal?

YES: Go to step 11AW5.

NO: Adjust or replace brake light switch.

11AW5: CHECK INPUT SIGNAL FOR TCM.

Connector & terminal (B55) No.24 (+) - Chassis ground (-):

Measure voltage between TCM and chassis ground.

CHECK: Is the voltage more than 10 Volt when depressing the brake pedal?

YES: Go to step 11AW6.

NO: Adjust or replace brake light switch.

11AW6: CHECK POOR CONTACT.
Check poor contact in TCM connector.

CHECK: Is there poor contact in TCM connector?

YES: Repair poor contact in TCM connector.

NO: Replace TCM.