P0703

AW: 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. Clearing Diagnostic Trouble Codes





WIRING DIAGRAMS

10AW1: CHECK OPERATION OF BRAKE LIGHT

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

YES: Go to step 10AW2.

NO: Repair or replace brake light circuit.

10AW2: CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.
1. Disconnect connectors from TCM 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 10AW3.

NO: Repair or replace harness and connector.

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

10AW3: CHECK HARNESS BETWEEN TCM AND BRAKE LIGHT SWITCH CONNECTOR.

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

Measure resistance of harness between TCM and chassis ground.

CHECK: Is the resistance more than 1 Mohm?

YES: Go to step 10AW4.

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

16AW4: CHECK INPUT SIGNAL FOR TCM.
1. Connect connectors to TCM and brake light switch.

Connector & Terminal (B55) No.24 (+) - Chassis Ground (-):

2. Measure voltage between TCM and chassis ground.

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

YES: Go to step 10AW5.

NO: Adjust or replace brake light switch.

10AW5: 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 V when depressing the brake pedal?

YES: Go to step 10AW6.

NO: Adjust or replace brake light switch.

10AW6: 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.