Inspection Procedure 2

INSPECTION PROCEDURE 2: The Cigarette Lighter Does Not Work.[Vehicles With Cigarette Lighter]

CAUTION: Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Cigarette Lighter Circuit (Part 1):

Cigarette Lighter Circuit (Part 2):

OPERATION
When the ignition switch is in the ON or ACC position, the cigarette lighter can be used.

TECHNICAL DESCRIPTION (COMMENT)
If the cigarette lighter cannot be used even when the ignition switch is in the ON or ACC position, ETACS-ECU, cigarette lighter itself, or cigarette lighter power supply circuit may have a problem.

TROUBLESHOOTING HINTS
- Malfunctions of cigarette lighter
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:
- MB992006: Extra fine probe
- MB991223: Harness set
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, read the diagnostic trouble code.

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. Refer to "How to connect scan tool (M.U.T.-III)." How to Connect the Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Check whether the ETACS-ECU related DTC is set
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Diagnose the ETACS-ECU.

NO : Go to Step 2.

STEP 2. Using scan tool MB991958, check data list.

Check the input signal of ACC relay. (ETACS-ECU)
- Turn the ignition switch to the ACC position.







Q: Does scan tool MB991958 display the item "ACC switch" as normal condition?

YES : Go to Step 3.

NO : Troubleshoot the ETACS-ECU. Refer to ETACS - Input Signal Procedure 1 "The ignition switch (ACC) signal is not sent to the ETACS-ECU". Inspection Procedure 1

STEP 3. Cigarette lighter check.

Refer to Cigarette Lighter Check. Testing and Inspection

Q: Is the check result normal?

YES : Go to Step 4.

NO : Replace the cigarette lighter. Then go to Step 10.

STEP 4. Check ETACS-ECU connector C-315 and cigarette lighter connector C-26 for loose, corroded or damaged terminals, or terminals pushed back in the connector

Q: Is ETACS-ECU connector C-315 and cigarette lighter connector C-26 in good condition?

YES : Go to Step 5.

NO : Repair the defective connector.

STEP 5. Check the power supply circuit to the cigarette lighter. Measure the voltage at cigarette lighter connector C-26.

1. Disconnect the connector, and measure at the wiring harness-side connector.
2. Turn the ignition switch to the ACC position.
3. Measure the voltage between cigarette lighter connector C-26 terminal No.2 and ground.
- The voltage should measure approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery positive voltage)?

YES : Go to Step 7.

NO : Go to Step 6.

STEP 6. Check the wiring harness between cigarette lighter connector C-26 terminal No.2 and ETACS-ECU connector C-315 terminal No.3.

- Check the power supply lines (battery power supply) for open circuit and short circuit.

Q: Is the wiring harness between cigarette lighter connector C-26 terminal No.2 and ETACS-ECU connector C-315 terminal No.3 in good condition?

YES : Go to Step 7.

NO : Repair the wiring harness.

STEP 7. Check the ground circuit to the cigarette lighter. Measure the resistance at cigarette lighter connector C-26.

1. Disconnect the connector, and measure the resistance available at the wiring harness side of the connector
2. Measure the resistance value between cigarette lighter connector C-26 terminal No.1 and ground.
- The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 9.

NO : Go to Step 8.

STEP 8. Check the wiring harness between cigarette lighter connector C-26 terminal No.1 and the ground.

- Check the ground wires for open circuit.

Q: Is the wiring harness between cigarette lighter connector C-26 terminal No.1 and the ground in good condition?

YES : Go to Step 9.

NO : Repair the wiring harness.

STEP 9. Retest the system

Check that the cigarette lighter operates normally.

Q: Is the check result normal?

YES : The trouble can be an intermittent malfunction.

NO : Replace the cigarette lighter.

STEP 10. Retest the system

Check that the cigarette lighter operates normally.

Q: Is the check result normal?

YES : The procedure is complete.

NO : Return to Step 1.