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Home >> Mitsubishi >> 2012 >> Lancer Evolution L4-2.0L Turbo (4B11T/C) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Cellular Phone >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Inspection Procedure 1

Inspection Procedure 1




Inspection Procedure 1: Check the hands free module power supply circuit.

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






















TECHNICAL DESCRIPTION (COMMENT)

- The power supply to the hands free module is provided by the fusible link No.36.
- The ACC signal is received hands free module C-11 terminal (terminal 15) from radio and CD player connector C-109 terminal (terminal 17).[ Vehicles with radio and CD player]
- The ACC signal is received hands free module C-11 terminal (terminal 15) from multivision display connector C-09 terminal (terminal 72).[Vehicles with MMCS]

TROUBLESHOOTING HINTS

- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The hands free module may be defective
- The radio and CD player may be defective.[ Vehicles with radio and CD player]
- The multivision display may be defective.[ Vehicles with MMCS]

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check hands free module connector C-11 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. IS hands free module connector C-11 in good condition?

YES Go to Step 2.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 2. Check the ground circuit to the hands free module. Measure the resistance at hands free module connector C-11.

(1)Disconnect hands free module connector C-11, and measure at the wiring harness side.





(2)Measure resistance between terminal 17 and ground.
OK: The resistance should be 2 ohms 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 hands free module connector C-11 (terminal 17) and ground.

- Check the body ground wires for open circuit.

Q. Is the wiring harness between hands free module connector C-11 (terminal 17) and ground in good condition?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
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 power supply circuit to the hands free module. Measure the voltage at hands free module connector C-11.

(1)Disconnect hands free module connector C-11, and measure the voltage available at the wiring harness side of the connector.





(2)Measure the voltage between terminal 1 and ground.
OK: 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 6.

NO Go to Step 5.

STEP 5. Check the wiring harness between hands free module connector C-11 (terminal 1) and fusible link (36).

- Check the power supply line for open circuit and short circuit.

NOTE:
Also check ETACS-ECU connector C-307, C-317 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If ETACS-ECU connector C-307, C-317 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between hands free module connector C-11 (terminal 1) and fusible link (36) in good condition?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
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 power supply circuit to the hands free module. Measure the voltage at hands free module connector C-11.

(1)Disconnect hands free module connector C-11, and measure the voltage available at the wiring harness side of the connector.

(2)Turn the ignition switch to "ACC" position.





(3)Measure the voltage between terminal 15 and ground.
OK: 1 voltage or less.
Q. Is the measured voltage approximately 12 volts (battery positive voltage)?

YES Replace the hands free module.

NO Go to Step 7.

STEP 7. Check radio and CD player connector C-109 [Vehicles with radio and CD player] or multivision display connector C-09 [Vehicles with MMCS] for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is radio and CD player connector C-109[ Vehicles with radio and CD player] or multivision display connector C-09[ Vehicles with MMCS] in good condition?

YES Go to Step 8.
NO Repair or replace the damaged component(s). Harness Connector Inspection.
STEP 8. Check the wiring harness between hands free module connector C-11 terminal (terminal 15) and radio and CD player connector C-109 terminal(terminal 17) [vehicles with radio and CD player] or multivision display connector C-09 terminal (terminal 72) [vehicles with MMCS].

- Check the signal line for open circuit and short circuit.

NOTE:
Also check intermediate connector C-110 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-110 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection. [Vehicles with MMCS]

Q. Is the check result normal?

YES Replace the radio and CD player or multivision display
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.
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