Inspection Procedure 8: The hazard warning lamp switch signal is not received.

caution

Whenever the ECU is replaced, ensure that the input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the hazard warning lamp switch is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

Keyless entry system (encrypted code registration)
Hazard warning lamp switch

PROBABLE CAUSES

Malfunction of the hazard warning lamp switch
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-08 hazard warning switch connector

Q. Is the check result normal?

Go to Step 2

Repair the defective connector.

STEP 2. Check the hazard warning switch.

Refer to

Q. Is the check result normal?

Go to Step 3

Replace the hazard warning switch.

STEP 3. Resistance measurement at the B-08 hazard warning switch connector.

(1)Disconnect the connector, and measure at the wiring harness side.

(2)Resistance between B-08 hazard warning lamp switch connector terminal No.2 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 5

Go to Step 4

STEP 4. Check the wiring harness between B-08 hazard warning switch connector (terminal 2) and the body earth.

Check the earth wires for open circuit.

note

Prior to the wiring harness inspection, check joint connector B-04 and earth connector B-11, and repair if necessary. <LHD>

note

Prior to the wiring harness inspection, check earth connector B-11, and repair if necessary. <RHD>

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction

Repair the wiring harness.

STEP 5. Connector check: B-317 ETACS-ECU connector

Q. Is the check result normal?

Go to Step 6

Repair the defective connector.

STEP 6. Check the wiring harness between B-317 ETACS-ECU connector (terminal 71) and B-08 hazard warning switch connector (terminal 1).

Check the input line for open circuit or short circuit.

Q. Is the check result normal?

Go to Step 7

Repair the wiring harness.

STEP 7. M.U.T.-III data list

Check the input signals from the hazard warning switch.

Operate the hazard warning switch.

Item No.	Item name	Normal condition
26	Hazard warning lamp switch	OFF to ON (only when switch is operated)

OK: Normal condition is displayed.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction

Replace the ETACS-ECU and register the ID codes (Refer to

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