Diagnosis Item 26: Diagnose when the M.U.T.-III cannot receive the data sent by radio and CD player <vehicles with radio and CD player>.



caution When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component connected to the CAN bus line may be broken.

FUNCTION




TROUBLE JUDGEMENT CONDITIONS




PROBABLE CAUSES



  • Damaged harness wires and connectors
  • Power supply circuit malfunction of the radio and CD player
  • Malfunction of the radio and CD player

DIAGNOSIS PROCEDURE


STEP 1. Connector check: joint connector (CAN5) and radio and CD player connector


caution The strand end of the twist wire should be within 10 cm from the connector. For details refer to .
When checking the joint connector, ensure that its wiring harness side and its short pins are not damaged.

Q. Is the check result normal?

Go to Step 2.
Repair the defective connector. Replace the joint connector as necessary.

STEP 2. Resistance measurement at joint connector (CAN5) and radio and CD player connector.


caution A digital multimeter should be used. For details refer to .
caution The test wiring harness should be used. For details refer to .
(1)Disconnect joint connector (CAN5) and the radio and CD player connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the LOCK (OFF) position.
(3)
caution When measuring the resistance, disconnect the negative battery terminal. For details refer to .
Ensure that the negative battery terminal is disconnected.
(4)Continuity between joint connector (CAN5) terminal No.7 and radio and CD player connector terminal No.3
OK: Continuity (2 Ω or less)
(5)Continuity between joint connector (CAN5) terminal No.18 and radio and CD player connector terminal No.13
OK: Continuity (2 Ω or less)
caution Strictly observe the specified wiring harness repair procedure. For details refer to .

Q. Is the check result normal?

<All the resistances measure 2 Ω or less> Power supply to the radio and CD player may be suspected. Diagnose the radio and CD player. Refer to GROUP 54A Radio and CD Player - Troubleshooting .
NO : <Either or all of the resistances measure more than 2 Ω> Repair the wiring harness between joint connector (CAN5) and the radio and CD player connector.