Code No.P1769: Stop Lamp Switch System


OPERATION


The stop lamp switch judges whether the brake pedal is depressed or released, and sends the information to the A/T-ECU.

DIAGNOSIS CODE SET CONDITIONS


If the stop lamp remains on for consecutively five minutes or more while the vehicle is being driven or all the stop lamp bulbs are blown, it is judged that there is a short or open circuit in the stop lamp switch and diagnosis code P1769 is set.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to perform the CAN bus diagnosis.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis Table ).

STEP 2. M.U.T.-III data list
Item 19: Stop lamp switch (Refer to Data List Table ).

Q. Is the check result normal?
Go to Step 3.
Stop lamp switch system check (Refer to GROUP 35B, Troubleshooting - Diagnosis Code Chart ).

STEP 3. Symptom recheck after erasing diagnosis code

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace A/T-ECU.

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