DTC U1006: Theft-Alarm Siren LIN Timeout: Diagnosis

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

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. Check ETACS-ECU connectors C-301, C-304, C-312 and C-317, LIN cutoff control unit connector C-140, theft-alarm siren connector A-61 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are ETACS-ECU connectors C-301, C-304, C-312 and C-317, LIN cutoff control unit connector C-140, theft-alarm siren connector A-61 in good condition?
- YES : Go to step 2.
- NO : Repair or replace the damaged component(s). Go to Step 12.
STEP 2. Check the ground circuit to the theft-alarm siren. Measure the resistance at theft-alarm siren connector A-61.
1. Disconnect theft-alarm siren connector A-61 and measure the resistance available at the wiring harness side of the connector.
2. Measure the resistance value between theft-alarm siren connector A-61 terminal 1 and ground.
  - The resistance should be 2 or less.
Q: Is the measured resistance 2 ohms or less?
- YES : Go to Step 4.
- NO : Go to Step 3.
STEP 3. Check the wiring harness between theft-alarm siren connector A-61 (terminal 1) and the ground.
Check the ground wires for open circuit.

NOTE: Also check intermediate connector A-60 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-60 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

Q: Is the wiring harness between theft-alarm siren connector A-61 (terminal 1) and the ground in good condition?
- YES : No action is necessary and testing is complete.
- NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 4. Check the battery power supply circuit to the theft-alarm siren. Measure the voltage at theft-alarm siren connector A-61.
1. Disconnect theft-alarm siren connector A-61 measure the voltage available at the wiring harness side of the connector.
2. Measure the voltage between theft-alarm siren connector A-62 terminal 2 and ground.
  - The voltage should measure approximately 12 volts (battery positive voltage).
    
    Fig 2: Measuring Voltage Between Lighting Control Sensor Connector A-61 Terminal 2 & Ground
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Is the measured voltage approximately 12 volts (battery positive voltage)?
- YES : Go to Step 6.
- NO : Go to Step 5.
STEP 5. Check the wiring harness between ETACS-ECU connector C-304 (terminal 4) and theft-alarm siren connector A-61 (terminal 2).
- Check the power supply line (battery supply) for open circuit and short circuit.
NOTE: Also check intermediate connector A-60 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector A-60 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

Q: Is the wiring harness between ETACS-ECU connector C-304 (terminal 4) and theft-alarm siren connector A-61 (terminal 2) in good condition?
- YES : No action is necessary and testing is complete.
- NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

STEP 6. Check the LIN cutoff control unit.

Remove the LIN cutoff control unit. Check for continuity between the following terminals and inspect the relay.

Continuity check

CONTINUITY CHECK

Terminal number	Measurement value
5 to 3	Continuity exists (2 ohms or less)

Relay check

RELAY CHECK

Battery voltage	Terminal number	Normal condition
At no energization	5 to 7	No continuity
	With current supply [terminal 1 (+), terminal 8 (-)]	Continuity exists (2 ohms or less)

Q: Is the LIN cutoff control unit in good condition?

YES : Go to Step 7.
NO : Replace the LIN cutoff control unit.

STEP 7. Check the battery power supply circuit to the ETACS-ECU. Measure the voltage at ETACS-ECU connector C-312.
1. Disconnect ETACS-ECU connector C-312 measure the voltage available at the wiring harness side of the connector.
2. Measure the voltage between ETACS-ECU connector C-312 terminal 9 and ground.
  - The voltage should measure approximately 12 volts (battery positive voltage).
  Fig 3: Measuring Voltage Between ETACS-ECU Connector C-312 Terminal 9 & Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 8. Check the wiring harness between ETACS-ECU connector C-317 (terminal 10) and LIN cutoff control unit connector C-140 (terminal 1).
- Check the power supply line (battery supply) for open circuit and short circuit.
Q: Is the wiring harness between ETACS-ECU connector C-317 (terminal 10) and LIN cutoff control unit connector C-140 (terminal 1) in good condition?
- YES : Go to Step 9.
- NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 9. Check the wiring harness between ETACS-ECU connector C-312 (terminal 9) and LIN cutoff control unit connector C-140 (terminal 8).
- Check the power supply line (battery supply) for open circuit and short circuit.
NOTE: Also check intermediate connector C-130 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-130 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

Q: Is the wiring harness between ETACS-ECU connector C-312 (terminal 9) and LIN cutoff control unit connector C-140 (terminal 8) in good condition?
- YES : Go to Step 12.
- NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 10. Check the wiring harness between ETACS-ECU connector C-301 (terminal 1) and LIN cutoff control unit connector C-140 (terminal 7).
- Check the communication line for open circuit.
Q: Is the wiring harness between ETACS-ECU connector C-301 (terminal 1) and LIN cutoff control unit connector C-140 (terminal 7) in good condition?
- YES : Go to Step 11.
- NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 11. Check the wiring harness between LIN cutoff control unit connector C-140 (terminal 5) and theft-alarm siren connector A-61 (terminal 3).
1. Check the communication line for open circuit.
NOTE: Also check intermediate connectors A-60 and C-130 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors A-60 and C-130 is damaged, repair or replace the connector as described in HARNESS CONNECTOR INSPECTION .

Q: Is the wiring harness between LIN cutoff control unit connector C-140 (terminal 5) and theft-alarm siren connector A-61 (terminal 3) in good condition?
- YES : Go to Step 12.
- NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
STEP 12. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.

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 THE SCAN TOOL (M.U.T.-III) .
2. Erase the DTC.
3. Turn the ignition switch to the "ON" position.
4. Check if the DTC is set.
5. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
1. YES : Replace the security alarm siren.
2. NO : A poor connection, open circuit or other intermittent malfunction is present in the LIN bus lines between the power window main switch and the ETACS-ECU (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).