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DTC 61

DTC 61: Stoplight Switch System

Stoplight Switch System Circuit:

















CIRCUIT OPERATION
The stoplight switch judges whether the brake pedal is depressed or released, and sends the information to the AWD-ECU.

DTC SET CONDITIONS
DTC 61 is set when the stoplight switch is ON for more than 15 minutes when the vehicle speed is above 15 km/h (9.3 mph).

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
^ Malfunction of brake pedal
^ Malfunction of stoplight switch
^ Damaged harness and connector
^ Malfunction of the AWD-ECU

DIAGNOSIS
Required Special Tool:
^ MB991958: Scan Tool (M.U.T-III Sub Assembly)
^ MB991824: V.C.I.
^ MB991827: USB Cable
^ MB991911: Main Harness B

STEP 1. Check that the stoplight illuminate and extinguish normally.
The stoplight should illuminate when the brake pedal is depressed, and extinguish when released.
Q: Is the stoplight switch operating properly?
YES: Go to Step 7.
NO: Go to Step 2.

STEP 2. Check the brake pedal height.
Q: Is the height adjusted properly?
YES: Go to Step 3.
NO: Adjust the brake pedal height.

STEP 3. Check the stoplight switch.
Q: Does the stoplight switch pass the checks?
YES: Go to Step 4.
NO: Replace the stoplight switch.

STEP 4. Using scan tool MB991958, check data list item 56: Stoplight Switch.

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.
2) Turn the ignition switch to ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 56: Stoplight Switch.
^ When the brake pedal is depressed, the display on scan tool MB991958 should be ON.
^ When the brake pedal is not depressed, the display on scan tool MB991958 should be OFF.

4) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Go to Step 5.

STEP 5. Check stoplight switch connector C-102 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 6.
NO: Repair or replace the damaged components.

STEP 6. Measure the voltage at stoplight switch connector C-102.








Disconnect the stoplight switch connector, and measure the voltage between terminal 2 and ground at the harness side. 9 The voltage should measure battery positive voltage.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 7.
NO: Go to Step 12.

STEP 7. Measure the stoplight switch output voltage at AWD-ECU connector C-138 by backprobing.








1) Connect the stoplight switch connector C-102.
2) Measure the voltage between AWD-ECU connector C-138 terminal 38 and ground by backprobing.
^ When the brake pedal is depressed, voltage should measure battery positive voltage.
^ When the brake pedal is not depressed, voltage should measure less than 1.0 volt.
Q: Is the check result normal?
YES: Go to Step 8.
NO: Go to Step 10.

STEP 8. Check AWD-ECU connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 9.
NO: Repair or replace the damaged components.

STEP 9. Using scan tool MB991958, check data list item 56: Stoplight Switch.





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.
2) Turn the ignition switch to ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 56: Stoplight Switch.
^ When the brake pedal is depressed, the display on scan tool MB991958 should be ON.
^ When the brake pedal is not depressed, the display on scan tool MB991958 should be OFF.

4) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Replace the AWD-ECU

STEP 10. Check joint connector (6) C-105, intermediate connector C-124 and AWD-ECU connector C-138 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.

STEP 11. Check the harness for open circuit or short circuit to ground between stoplight switch connector C-102 terminal 1 and AWD-ECU connector C-138 terminal 38.








Q: Is the harness wire in good condition?
YES: Go to Step 9.
NO: Repair or replace the harness wire.

STEP 12. Check intermediate connector C-129 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 13.
NO: Repair or replace the damaged components.

STEP 13. Check the harness for open circuit or short circuit to ground between stoplight switch connector C-102 terminal 2 and battery.





Q: Is the harness wire in good condition?
YES: Go to Step 9.
NO: Repair or replace the harness wire.
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