Code No.P1571: Malfunction of the Stop Lamp Switch System.
OPERATION
- Battery positive voltage is supplied to the stop lamp switch (terminal No.2 and No.4.)
- When the brake pedal is depressed, battery positive voltage is applied to the engine-ECU terminal No.125 and No.126.
DIAGNOSIS CODE SET CONDITIONS
Check Condition
- The cruise control indicator lamp illuminates.
Judgement Criteria
- Open/short in stop lamp switch circuit.
- Open circuit in the brake switch circuit (between engine-ECU terminal No.126 and earth.)
PROBABLE CAUSES
- Damaged harness or connector.
- Malfunction of the stop lamp switch.
- Malfunction of the engine-ECU.
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STEP 1. Check the data list.
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Using M.U.T.-III, check the data list (Refer to  - data list reference table.)
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- Item 135: Stop lamp switch.
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Q.
Is the check result normal?
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 Go to Step 13.
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 Go to Step 2.
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STEP 2. Check the stop lamp operation.
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Check the stop lamp operation.
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OK:
Brake pedal depressed: Stop lamp will illuminate.
Brake pedal not depressed: Stop lamp does not illuminate.
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Q.
Is the check result normal?
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Go to Step 3.
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Go to Step 5.
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STEP 3. Connectors check: D-215 engine-ECU connector, D-230 intermediate connector and D-113 J/C (6).
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Q.
Is the check result normal?
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Go to Step 4.
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Repair or replace the damaged connector. Then go to Step 21.
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STEP 4. Check the harness wire between engine-ECU connector D-215 terminal No.125 and stop lamp switch connector D-134 terminal No.1.
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Q.
Is the check result normal?
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Go to Step 12.
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Repair the damaged harness wire. Then go to Step 21.
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STEP 5. Measure the voltage at stop lamp switch connector D-134.
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(1)Disconnect stop lamp switch connector D-134 and measure at the harness connector side.
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(2)Measure the voltage between stop lamp switch connector D-134 terminal No.2 and earth.
OK: System voltage
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(3)Connect stop lamp switch connector D-134.
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 6.
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STEP 6. Connectors check: D-134 stop lamp switch connector and D-241 intermediate connector.
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Q.
Is the check result normal?
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Go to Step 7.
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Repair or replace the damaged connector. Then go to Step 21.
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STEP 7. Check the harness wire between stop lamp switch connector D-134 terminal No.2 and fuse No.16 at the relay box in engine compartment.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair the damaged harness wire. Then go to Step 21.
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STEP 8. Check the fuse No.16 at the relay box in engine compartment.
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Q.
Is the check result normal?
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Go to Step 12.
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Check the stop lamp system harness and replace the fuse. Then go to Step 21.
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STEP 9. Connector check: D-134 stop lamp switch connector.
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Q.
Is the check result normal?
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Go to Step 10.
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Repair or replace the damaged connector. Then go to Step 21.
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STEP 10. Check the harness wire between stop lamp switch connector D-134 terminal No.1 and intermediate connector D-230 terminal No.10.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair the damaged harness wire. Then go to Step 21.
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STEP 11. Check the stop lamp switch.
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(1)Remove the stop lamp switch (Refer to GROUP 35A - Brake Pedal .)
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(2)Check for continuity between the stop lamp switch terminals (Refer to GROUP 35A - Brake Pedal, Stop Lamp Switch Check .)
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Q.
Is the check result normal?
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Install the stop lamp switch (Refer to GROUP 35A - Brake Pedal .) Then go to Step 12.
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Replace the stop lamp switch (Refer to GROUP 35A - Brake Pedal .) Then go to Step 21.
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STEP 12. Check the data list.
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Using M.U.T.-III, check the data list (Refer to - data list reference table.)
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- Item 135: Stop lamp switch.
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Q.
Is the check result normal?
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Go to Step 13.
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Replace the engine-ECU (Refer to GROUP 13B - Engine-ECU .) Then go to Step 21.
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STEP 13. Check the data list.
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Using M.U.T.-III, check the data list (Refer to - data list reference table.)
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Q.
Is the check result normal?
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Go to Step 20.
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Go to Step 14.
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STEP 14. Measure the terminal voltage at engine-ECU connector D-215.
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(1)Turn the ignition switch to the "ON" position.
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(2)Do not disconnect the engine-ECU connectors.
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(3)Measure the terminal voltage between engine-ECU connector D-215 terminal No.126 and earth with engine-ECU connector connected.
OK:
Brake pedal depressed: System voltage.
Brake pedal not depressed: 1 V or less.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Q.
Is the check result normal?
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Go to Step 19.
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Go to Step 15.
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STEP 15. Connectors check: D-134 stop lamp switch connector, D-231 intermediate connector and D-215 engine-ECU connector.
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Q.
Is the check result normal?
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Go to Step 16.
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Repair or replace the damaged connector. Then go to Step 21.
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STEP 16. Check the harness wire between engine-ECU connector D-215 terminal No.126 and stop lamp switch connector D-134 terminal No.4.
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Q.
Is the check result normal?
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Go to Step 17.
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Repair the damaged harness wire. Then go to Step 21.
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STEP 17. Check the harness wire between stop lamp switch connector D-134 terminal No.3 and earth
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Q.
Is the check result normal?
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Go to Step 18.
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Repair the damaged harness wire. Then go to Step 21.
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STEP 18. Check the stop lamp switch.
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(1)Remove the stop lamp switch (Refer to GROUP 35A - Brake Pedal .)
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(2)Check for continuity between the stop lamp switch terminals (Refer to GROUP 35A - Brake Pedal, Stop Lamp Switch Check .)
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Q.
Is the check result normal?
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Install the stop lamp switch (Refer to GROUP 35A - Brake Pedal .) Then go to Step 19.
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Replace the stop lamp switch (Refer to GROUP 35A - Brake Pedal .) Then go to Step 21.
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STEP 19. Check the data list.
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Using M.U.T.-III, check the data list (Refer to - data list reference table.)
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Q.
Is the check result normal?
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Go to Step 20.
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Replace the engine-ECU (Refer to GROUP 13B - Engine-ECU .) Then go to Step 21.
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STEP 20. Read the diagnosis code.
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(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.
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(2)Connect the negative battery terminal.
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(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn ON the cruise control indicator lamp.)
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(4)With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the diagnosis code of the cruise control system (Refer to .)
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Q.
Is diagnosis code No.P1571 set?
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Replace the engine-ECU (Refer to GROUP 13B - Engine-ECU .) Then go to Step 21.
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It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions .)
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STEP 21. Check the data list.
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Using M.U.T.-III, check the data list (Refer to - data list reference table.)
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- Item 134: Brake switch.
- Item 135: Stop lamp switch.
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Q.
Is the check result normal?
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Go to Step 22.
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Return to Step 2.
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STEP 22. Read the diagnosis code.
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(1)Disconnect the negative battery terminal, and erase the diagnosis code of the cruise control system.
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(2)Connect the negative battery terminal.
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(3)Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to ON (turn ON the cruise control indicator lamp.)
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(4)With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the diagnosis code of the cruise control system (Refer to .)
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Q.
Is diagnosis code No.P1571 set?
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Return to Step 1.
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The procedure is complete.
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