Diagnostics Item 22

DIAGNOSTIC ITEM 22: Diagnose when the scan tool cannot receive the data sent by satellite radio tuner.

CAUTION:
When servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do so, a component connected to the CAN bus line may be damaged.














FUNCTION

If the scan tool MB991958 cannot communicate with the satellite radio tuner, this diagnosis result will be set.

TROUBLE JUDGMENT CONDITIONS

If a communication flag is not set for the satellite radio tuner, the ETACS-ECU determines that there is a failure.

TROUBLESHOOTING HINTS

- Malfunction of the connector [joint connector (CAN1), satellite radio tuner connector improperly connected]
- Malfunction of the wiring harness [open circuit between the satellite radio tuner connector and the joint connector (CAN1), power supply circuit to the satellite radio tuner]
- Malfunction of the satellite radio tuner

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

CAUTION:
The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to Precautions When CAN Bus Line(s) are Repaired.

Q. Are joint connector (CAN1) C-105 and satellite radio tuner connector C-18 in good condition?

YES Go to Step 2.
NO Repair the damaged parts.
STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for open circuit.

CAUTION:
Strictly observe the specified wiring harness repair procedure.
For details refer to Precautions When CAN Bus Line(s) are Repaired.

(1)Disconnect joint connector (CAN1) C-105 and satellite radio tuner connector C-18, and check the wiring harness.





(2)Check the wiring harness between joint connector (CAN1) C-105 (terminal 4) and satellite radio tuner connector C-18 (terminal 4)
OK: Continuity exists (2ohms or less)






(3)Check the wiring harness between joint connector (CAN1) C-105 (terminal 15) and satellite radio tuner connector C-18 (terminal 11)
OK: Continuity exists (2ohms or less)

Q. Is the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 in good condition?

YES Check the power supply circuit of the satellite radio tuner. Symptom Chart (Satellite Radio).

NO Repair the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18.