STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
STEP 2. DTC check after resetting CAN bus lines
STEP 3. Brake fluid level check
STEP 5. Brake fluid level switch check
STEP 6. Connector check: A-10 brake fluid level switch connector, C-410 ETACS-ECU connector
STEP 7. Measure the voltage at A-10 brake fluid level switch connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the terminal No. 1 and the body ground.OK: Approximately system voltage
Is the check result normal?
Go to Step 9. Go to Step 8.
STEP 8. Measure the voltage at the C-410 ETACS-ECU connector.
caution | With the C-410 ETACS-ECU connector kept connected, disconnect the A-10 brake fluid level switch connector. |
(1) Turn the ignition switch to the "ON" position.
(2) Measure the voltage between terminal No.1 and the body ground by backprobing.OK: Approximately system voltage
Is the check result normal?
Repair the wiring harness between the C-410 ETACS-ECU connector terminal No. 1 and the A-10 brake fluid level switch connector terminal No. 1. Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ). Then go to Step 17.
STEP 9. Wiring harness check: between A-10 brake fluid level switch connector and body ground
STEP 10. Parking brake lever stroke check
STEP 11. Parking brake switch check
STEP 12. Connector check: D-36 parking brake switch connector
STEP 13. Measure the voltage at D-36 parking brake switch connector.
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between the terminal No.1 and the body ground.OK: Approximately system voltage
Is the check result normal?
Go to Step 16. Go to Step 14.
STEP 14. Connector check: C-203 Combination meter connector, C-26 intermediate connector
STEP 15. Wiring harness check: between the C-203 combination meter connector and the D-36 parking brake switch connector
STEP 16. Retest the system.
STEP 17. Retest the system.