STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
(1) caution | To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE). |
Connect scan tool (M.U.T.-IIISE). Refer to "How to Connect the Scan Tool (M.U.T.-IIISE)
."
(2) Check that the ETACS-ECU has not set a DTC.
Is the DTC set?
Carry out the DTC procedures (Refer to GROUP 54A - ETACS-ECU ). Go to Step 2.
STEP 2. Check the heated steering wheel switch.
STEP 3. Check the clock spring.
STEP 4. Check the heated steering wheel relay.
STEP 5. Resistance measurement at the heated steering wheel relay connector (ground terminal).
(1) Disconnect the relay, and measure at the wiring harness side.
(2) Resistance between the heated steering wheel relay connector (terminal No.1) and body ground.OK: Continuity exists (2 ohms or less)
Is the check result normal?
Go to Step 7. Go to Step 6.
STEP 6. Check of open circuit in ground line between heated steering wheel relay connector (terminal No.1) and body ground.
STEP 7. Check of short to power supply, short to ground, and open circuit in IG1 line between ETACS-ECU and heated steering wheel relay connector.
STEP 8. Voltage measurement at the between heated steering wheel relay connector (power supply terminal)
(1) Disconnect the relay, and measure at the wiring harness side.
(2) Measure the voltage between the heated steering wheel relay connector (terminal No.3) and body ground.OK: Approximately system voltage
Is the check result normal?
Go to Step 11. Go to Step 9.
STEP 9. Check the fusible link and relay box.
STEP 10. Check of short to power supply, short to ground, and open circuit in power supply line between fusible link and heated steering wheel relay connector (terminal No.3) connector
STEP 11. Resistance measurement at the C-311 clock spring connector (ground terminal).
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Resistance between the C-311 clock spring connector (terminal No.1) and body ground.OK: Continuity exists (2 ohms or less)
Is the check result normal?
Go to Step 13. Go to Step 12.
STEP 12. Check of open circuit in ground line between C-311 clock spring connector (terminal No.1) and body ground.
STEP 13. Check of short to power supply, short to ground, and open circuit in power supply line between heated steering wheel relay connector and C-311 clock spring connector (terminal No.3)
STEP 14. Check of short to power supply, short to ground, and open circuit in input line between heated steering wheel relay connector and C-311 clock spring connector (terminal No.4)
STEP 15. Retest the system