Diagnosis Item 24: 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 JUDGMENT CONDITIONS

TROUBLESHOOTING HINTS

Malfunction of the connector [joint connector (CAN1) or radio and CD player connector improperly connected]
Malfunction of the wiring harness [open circuit between the radio and CD player connector and the joint connector (CAN1), power supply circuit of the radio and CD player]
Malfunction of the radio and CD player

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-04 joint connector (CAN1) and C-103 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

Q. Is the check result normal?

	Go to Step 2.

	Repair the defective connector.

STEP 2. Check the wiring harness between C-103 radio and CD player connector and C-04 joint connector (CAN1)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect radio and CD player connector and joint connector (CAN1), and check the following wiring harness for open circuit

(1)The wiring harness between C-103 radio and CD player connector terminal No.23 and C-04 joint connector (CAN1) terminal No.7 <CAN_H>
OK: Continuity exists (2 Ω or less)

(2)The wiring harness between C-103 radio and CD player connector terminal No.33 and C-04 joint connector (CAN1) terminal No.20 <CAN_L>
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

	Check the power supply circuit of the radio and CD player. Refer to GROUP 54A - Radio and CD player - Troubleshooting .

	Repair the wiring harness.