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DTC 22

DTC 22: Stoplight Switch System

Stoplight Switch System Circuit (Part 1):




Stoplight Switch System Circuit (Part 2):






CIRCUIT OPERATION
- As for the stoplight switch, when the brake pedal is depressed, the stoplight switch signal is transmitted from the ETACS-ECU to the ECM via CAN bus line.
- As for the brake switch, when the brake pedal is depressed, battery positive voltage is supplied to the stoplight switch (terminal 3), and when the brake pedal is not depressed, the voltage of ECM (terminal 108) will indicate 0 volt.

DTC SET CONDITIONS

Check Condition
- The "CRUISE" indicator light illuminates.

Judgement Criteria
- Short or open in stoplight switch circuit.
- Open circuit in the brake switch circuit (between ECM terminal 108 and ground).
- Malfunction of CAN bus line.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
- Malfunction of CAN bus system.
- Damaged harness or connector.
- Malfunction of the stoplight switch.
- Malfunction of the ETACS-ECU
- Malfunction of the ECM

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

- MB991223: Harness Set
- MB992006: Extra Fine Probe

CAUTION:
- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Before replacing the ECU, ensure that the CAN bus lines is normal.

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.






CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line. How to Diagnose the CAN Bus Line
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the check result satisfactory?

YES : Go to Step 2.

NO : Repair the CAN bus lines (Refer to Controller Area Network, Diagnosis-CAN Bus Diagnostics Chart). Then go to Step 15.

STEP 2. Using scan tool MB991958, check the data list item 74: Brake light switch.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- Item 74, Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 9.

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, check the ETACS system data list item 290: Brake light switch.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for ETACS system (Refer to Chassis Electrical, Diagnosis- Data List Reference Table).
- Item 290, Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Replace the ECM [2.4L Engine] or ECM [3.0L Engine]. Then go to Step 15.

NO : Go to Step 4.

STEP 4. Check stoplight switch connector C-124 and ETACS-ECU connector C-304 and C-312 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?

YES : Go to Step 5.

NO : Repair or replace the damaged components (Refer to General (Electrical), Harness Connector Inspection). Then go to Step 15.

STEP 5. Check the harness wire between ETACS-ECU connector C-304 terminal 1 and stoplight switch connector C-124 terminal 2, and check the harness wire stoplight switch connector C-124 terminal 1 and ETACS-ECU connector C-312 terminal 16 for damage.

Q: Are the harness wires in good condition?

YES : Go to Step 6.

NO : Repair the damaged harness wire. Then go to Step 15.

STEP 6. Check the stoplight switch.

1. Remove the stoplight switch (Refer to Basic Brake System, Brake Pedal).




2. Connect an ohmmeter to the stoplight switch between terminals 1 and 2.
3. Check for continuity between the terminals when the plunger of the stoplight switch is pushed in and when it is released.




4. The stoplight switch is operating properly if the circuit is open between terminals 1 and 2 when the plunger is pushed in to a depth of within 4.0 mm (0.16 inch) from the outer case edge surface, and if the resistance value is less than 2 ohms between terminals 1 and 2 when it is released.

Q: Is the stoplight switch operating properly?

YES : Install the stoplight switch (Refer to Basic Brake System, Brake Pedal). Then go to Step 7.

NO : Replace the stoplight switch (Refer to Basic Brake System, Brake Pedal). Then go to Step 15.

STEP 7. Check fuse number 2 at the ETACS-ECU.






Q: Is the fuse in good condition?

YES : Go to Step 8.

NO : Check the stoplight system harness and replace the fuse. Then go to Step 15.

STEP 8. Using scan tool MB991958, check the ETACS system data list item 290: Brake light switch.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for ETACS system (Refer to Chassis Electrical, Data List Reference Table).
- Item 290, Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 15

NO : Replace the ETACS-ECU (Refer to Chassis Electrical, ETACS-ECU). Then go to Step 15.

STEP 9. Using scan tool MB991958, check the data list item 89: Normally closed brake switch.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- Item 89, Normally closed brake switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 14.

NO : Go to Step 10.

STEP 10. Check ECM connector B-11 and stoplight switch connector C-124 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are the connectors and terminals in good condition?

YES : Go to Step 11.

NO : Repair or replace the damaged components (Refer to General (Electrical), Harness Connector Inspection). Then go to Step 15.

STEP 11. Check the harness wire between ECM connector B-11 terminal 108 and stoplight switch connector C-124 terminal 3, and check the harness wire between stoplight switch connector C-124 terminal 4 and ground for damage.






Q: Are the harness wires in good condition?

YES : Go to Step 12.

NO : Repair the damaged harness wire. Then go to Step 15.

STEP 12. Check the stoplight switch.

1. Remove the stoplight switch (Refer to Basic Brake System, Brake Pedal).




2. Connect an ohmmeter to the stoplight switch between terminals 3 and 4.
3. Check for continuity between the terminals when the plunger of the stoplight switch is pushed in and when it is released.




4. The stoplight switch is operating properly if the circuit is open between terminals 3 and 4 when the plunger is released, and if resistance value is less than 2 ohms between terminals 3 and 4 when the plunger is pushed in to a depth of within 4.5 mm (0.18 inch) from the outer case edge surface.

Q: Is the stoplight switch operating properly?

YES : Install the stoplight switch (Refer to Basic Brake System, Brake Pedal). Then go to Step 13.

NO : Replace the stoplight switch (Refer to Basic Brake System, Brake Pedal). Then go to Step 15.

STEP 13. Using scan tool MB991958, check the data list item 89: Normally closed brake switch.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- Item 89, Normally closed brake switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : It can be assumed that this malfunction is intermittent (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points- How to Cope with Intermittent Malfunctions).

NO : Replace the ECM [Refer to MFI, Engine Control Module (ECM))] [2.4L Engine] or [Refer to MFI, Engine Control Module (ECM))] [3.0L Engine]. Then go to Step 15.

STEP 14. Read the diagnostic trouble codes.

1. Erase diagnostic trouble code.. Clearing Diagnostic Trouble Codes
2. 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" indicator light).
3. With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the diagnostic trouble codes. Reading Diagnostic Trouble Codes

Q: Is DTC P22 set?

YES : Replace the ECM [2.4L Engine] or ECM [3.0L Engine]. Then go to Step 15.

NO : It can be assumed that this malfunction is intermittent (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).

STEP 15. Using scan tool MB991958, check the data list item 74: Brake light switch, item 89: Normally closed brake switch.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. Reading Diagnostic Trouble Codes
- Item 74, Brake light switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

- Item 89, Normally closed brake switch.
- When the brake pedal is depressed, the display on scan tool MB991958 should be "ON".
- When the brake pedal is released, the display on scan tool MB991958 should be "OFF".

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the switch operating properly?

YES : Go to Step 16.

NO : Return to Step 2.

STEP 16. Read the diagnostic trouble codes.

1. Erase diagnostic trouble code. Clearing Diagnostic Trouble Codes
2. 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" indicator light).
3. With the cruise control switches not operated, depress the brake pedal for several seconds, and then read the diagnostic trouble codes. Reading Diagnostic Trouble Codes

Q: Is DTC P22 set?

YES : Return to Step 1.

NO : The procedure is complete.
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