Inspection Procedure 3: ECALL speaker/front door speaker (RH) does not sound: Diagnosis

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe

STEP 1. Using scan tool (M.U.T.-IIISE), check the special Function.
Using scan tool (M.U.T.-IIISE), select "Test" from the special function of the TCU.

CAUTION: To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
1. Connect scan tool (M.U.T.-IIISE). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) ."
  - Item 2: Emergency speaker check (Beep)
  - Item 4: Door speaker check (Beep)
    Q: Is the check result normal?
    
    YES: The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
    
    NO <Only ECALL speaker has abnormality>: Go to Step 2.
    
    NO <Only front door speaker (RH) has abnormality>: Go to Step 4.
    
    NO <Both of ECALL speaker and front door speaker (RH) have abnormality>: Go to Step 8.

STEP 2. Check ECALL speaker.

Remove the ECALL speaker (Refer to ECALL SPEAKER ).

Check that the ECALL speaker outputs the noise when the voltage of 5 volts is applied to the ECALL speaker connector terminal.

Q: Do the ECALL speaker output the noise?

YES: Replace the ECALL speaker (Refer to ECALL SPEAKER ).

NO: Go to Step 3.

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 3. Resistance measurement at the ECALL relay box assembly connector (ESO-, ESO+ terminals).
1. Disconnect the ECALL relay box assembly connector, and measure at the wiring harness side.
2. Check the resistance between the ECALL relay box assembly connector (ESO- terminal) and (ESO+ terminal).
  OK: 1.5 - 70 ohms
3. Check the resistance between the ECALL relay box assembly connector (ESO+ terminal) and body ground.
  OK: No continuity
  
  Q: Is the check result normal?
  
  YES: Replace the ECALL relay box assembly (Refer to ECALL RELAY BOX ASSEMBLY ).
  
  NO: Repair the connector(s) or wiring harness.
STEP 4. Voltage measurement at the ECALL relay box assembly connector (IG, GND terminals).
1. Disconnect the ECALL relay box assembly connector, and measure at the wiring harness side.
2. Turn the ignition switch from OFF position to ON position.
3. Check the voltage between the ECALL relay box assembly connector (IG terminal) and (GND terminal).
  OK: The voltage should measure approximately 12 volts (battery positive voltage).
  
  Q: Is the check result normal?
  
  YES: Correct the IG line circuit or GND circuit of the ECALL relay box assembly.
  
  NO: Go to Step 5.

STEP 5. Check front door speaker (RH).

Remove the front door speaker (RH) (Refer to ON-VEHICLE SERVICE ).

Check that the ECALL speaker outputs the noise when the voltage of 5 volts is applied to the ECALL speaker connector terminal.

Q: Do the front door speaker (RH) output the noise?

YES: Replace the front door speaker (RH) (Refer to ON-VEHICLE SERVICE ).

NO: Go to Step 6.

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

STEP 6. Resistance measurement at the ECALL relay box assembly connector (terminals No. 11, 12).
1. Disconnect the ECALL relay box assembly connector, and measure at the wiring harness side.
2. Check the resistance between the ECALL relay box assembly connector (DSO+ terminal) and (DSO- terminal).
  OK: 1.5 - 70 ohms
3. Check the resistance between the ECALL relay box assembly connector (DSO+ terminal) and body ground.
  OK: No continuity
  
  Q: Is the check result normal?
  
  YES: Go to Step 7.
  
  NO: Repair the connector(s) or wiring harness.
STEP 7. Voltage measurement at the ECALL relay box assembly connector (RLE1, RLE2 terminals).
1. Disconnect the ECALL relay box assembly connector, and measure at the wiring harness side.
2. Turn the ignition switch from OFF position to ON position.
  CAUTION: Execute item No. 4 "Door speaker check (Beep)" in the scan tool (M.U.T.-IIISE) special function "Test", and measure the voltage.
3. Check the voltage between the ECALL relay box assembly connector (RLE1 terminal) and body ground.
  OK: Approximately 5 volts
4. Check the voltage between the ECALL relay box assembly connector (RLE2 terminal) and body ground.
  OK: Approximately 5 volts
  
  Q: Is the check result normal?
  
  YES: Replace the ECALL relay box assembly (Refer to ECALL RELAY BOX ASSEMBLY ).
  
  NO: Replace the TCU (Refer to TCU ).
STEP 8. Resistance measurement at the TCU connector (SPO+, SPO- terminals).
1. Disconnect the TCU connector, and measure at the wiring harness side.
2. Check the resistance between the TCU connector (SPO+ terminal) and (SPO- terminal).
  OK: 1.5 - 70 ohms
3. Check the resistance between the TCU connector (SPO+ terminal) and body ground.
  OK: No continuity
  
  Q: Is the check result normal?
  
  YES: Go to Step 10.
  
  NO: Go to Step 9.
STEP 9. Resistance measurement at the TCU connector (SPO+, SPO- terminals).
1. Disconnect the TCU connector and the ECALL relay box assembly connector, and measure at the wiring harness side.
2. Check the resistance between the TCU connector (SPO+ terminal) and the ECALL relay box assembly connector (ESI+ terminal).
  OK: The resistance should be 2 ohms or less
3. Check the resistance between the TCU connector (SPO- terminal) and the ECALL relay box assembly connector (ESI- terminal).
  OK: The resistance should be 2 ohms or less
4. Check the resistance between the TCU connector (SPO+ terminal) and body ground.
  OK: No continuity
5. Check the resistance between the TCU connector (SPO- terminal) and body ground.
  OK: No continuity
  
  Q: Is the check result normal?
  
  YES: Replace the ECALL relay box assembly (Refer to ECALL RELAY BOX ASSEMBLY ).
  
  NO: Repair the connector(s) or wiring harness.
STEP 10. Retest the system.
Q: Is the check result normal?

YES: The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

NO: Replace the TCU (Refer to TCU ).