![[Previous]](../../../buttons/fprev.png)
![[Next]](../../../buttons/fnext.png)
DTC B2240: Communication error with CAN Box
| caution |
- If DTC B2240 is set, be sure to diagnose the CAN bus line.
- When replacing the CAN box unit or audio visual navigation unit, always check that the communication circuit is normal. (Check that the voltage is 10 V or more.)
|
TROUBLE JUDGMENT
When the abnormality occurs in the transmission/reception data between the CAN box unit and audio visual navigation unit, the CAN box unit sets DTC B2240.
PROBABLE CAUSES
- Audio visual navigation unit malfunction
- CAN box unit malfunction
- Damaged wiring harness and connectors
|
|
Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958 Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A (Vehicles with CAN communication system)
|
|
|
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
|
|
(1)
| caution |
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
|
Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)  ."
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is the CAN bus line found to be normal?
 Go to Step 2.
 Repair the CAN bus line. (Refer to GROUP 54C, Diagnosis ).
|
|
|
STEP 2. Perform "Network/Connect Line Check" of the MMCS service mode.
|
|
|
Perform "Network/Connect Line Check" of the MMCS service mode, and check that the communication between the CAN box unit and the audio visual navigation unit is normal. (Refer to .)
|
|
|
OK: "CAN BOX OK" is displayed.
|
|
|
| note |
When the communication between the audio visual navigation unit and the CAN box unit is not possible, "CAN BOX" is not displayed.
|
|
|
|
Q.
Is "CAN BOX OK" displayed?
|
|
|
Go to Step 5.
|
|
|
|
|
|
Go to Step 3.
|
|
|
|
|
|
STEP 3. Check CAN box unit connector C-108 and audio visual navigation unit connector C-12 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
|
|
|
Q.
Are CAN box unit connector C-108 and audio visual navigation unit connector C-12 in good condition?
|
|
|
Go to Step 4.
|
|
|
|
|
|
Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection . The steering remote control switch should work normally.
|
|
|
|
|
|
STEP 4. Check the wiring harness between CAN box unit connector C-108 (terminal 4, 5, 6) and audio visual navigation unit connector C-12 (terminal 43, 59, 58).
|
|
|
- Check the communication lines for open circuit and short circuit.
|
|
|
Q.
Is the wiring harness between CAN box unit connector C-108 (terminal 5, 4, 6) and audio visual navigation unit connector C-12 (terminal 43, 59, 58) in good condition?
|
|
|
Go to Step 5.
|
|
|
|
|
|
The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.
|
|
|
|
|
|
STEP 5. Recheck for diagnostic trouble code.
|
|
|
Check again if the DTC is set to the CAN box unit.
|
|
|
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
|
|
|
(4)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
Go to Step 6.
|
|
|
|
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
|
|
|
|
|
|
STEP 6. Recheck for diagnostic trouble code.
|
|
|
Temporarily replace the audio visual navigation unit, and check if the DTC is set to the CAN box unit.
|
|
|
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
|
|
|
(4)Turn the ignition switch to the "LOCK" (OFF) position.
|
|
|
Replace the CAN box unit.
|
|
|
|
|
|
Replace the audio visual navigation unit.
|
|
|
|
)
)
)