Inspection Procedure 10: The stop lamp switch signal is not received.


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

COMMENTS ON TROUBLE SYMPTOM


If there is an error to the stop lamp switch input signal, the stop lamp switch signal is no longer output to the communication line.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Check the stop lamp switch.


Refer to GROUP 35A - Brake Pedal .

Q. Is the check result normal?

Go to Step 2.

Replace the stop lamp switch.

STEP 2. Voltage measurement at stop lamp switch connector (power supply terminal)


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Check the voltage between the stop lamp switch connector (power supply terminal) and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 4.

Go to Step 3.

STEP 3. Check of short to power supply, short to earth, and open circuit in power supply line between stop lamp switch connector and fusible link


Q. Is the check result normal?

Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

Repair the connector(s) or wiring harness.

STEP 4. Check of short to power supply, short to earth, and open circuit in BKLP line between ETACS-ECU connector and stop lamp switch connector


Q. Is the check result normal?

Go to Step 5.

Repair the connector(s) or wiring harness.

STEP 5. M.U.T.-III data list


Check the input signals from the stop lamp switch.

Item No.
 Item name
 Normal condition
108
 Stop 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.