Inspection Procedure 8: Power supply or communication circuit to the CAN box unit is defective: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe

STEP 1. Check the multivision display
Check if the multivision display power is turned ON.

Q: Is the check result normal?
- YES: Go to Step 2
- NO: Perform Inspection Procedure 1 "No navigation screen is displayed." (Refer to INSPECTION PROCEDURE 1: NO NAVIGATION SCREEN IS DISPLAYED. .)
STEP 2. Voltage measurement at CAN box unit connector (+B, ACC terminal).
1. Disconnect the connector, and measure at the wiring harness side.
2. Check the voltage between the CAN box unit connector (+B, ACC terminal) and ground.
  OK: The voltage should measure approximately 12 volts (battery positive voltage).
Q: Is the check result normal?
- YES: Go to Step 4
- NO: Go to Step 3
STEP 3. Check of short to power supply, short to ground, and open circuit in +B, ACC line between CAN box unit connector and joint connector
Q: Is the check result normal?
- YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
- NO: Repair the connector(s) or wiring harness.
STEP 4. Resistance measurement at CAN box unit connector (GND terminal).
1. Disconnect the connector, and measure at the wiring harness side.
2. Check the continuity between the CAN box unit connector (GND terminal) and ground.
  OK: The resistance should be 2 ohms or less
Q: Is the check result normal?
- YES: Go to Step 6
- NO: Go to Step 5
STEP 5. Check of open circuit in GND line between CAN box unit connector and ground
Q: Is the check result normal?
- YES: The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
- NO: Repair the connector(s) or wiring harness.
STEP 6. Check of short or open circuit in TX-C, RX-C, CK-C, SH-C line between CAN box unit connector and multivision display connector
Q: Is the check result normal?
- YES: Replace the CAN box unit.
- NO: Repair the connector(s) or wiring harness.