B2621

STEERING COLUMN: POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM: B2621: Communication Interruption

DTC B2621 - Communication Interruption

DESCRIPTION

The multiplex tilt and telescopic ECU forms a network with the ECUs of other systems through the communication bus. Each ECU informs the other ECUs that it is connected to the network by outputting a specified signal (periodical signal) onto the communication bus on a regular schedule. The multiplex tilt and telescopic ECU detects the connection of each ECU based on the signal.






INSPECTION PROCEDURE

PROCEDURE

1. CHECK OTHER DTC OUTPUT
(a) Check if DTC B1200, B1210, B1272 or B1278 is output.
Result:





HINT:
- If any other codes besides B2621 are output, perform troubleshooting for those DTCs first.
- DTC B1200 indicates a body ECU communication stop malfunction for the multiplex communication system.
- DTC B1210 indicates a power source control ECU communication stop malfunction for the multiplex communication system.
- DTC B1272 indicates a power seat ECU communication stop malfunction for the multiplex communication system.
- DTC B1278 indicates a combination switch ECU communication stop malfunction for the multiplex communication system.

B -- REPLACE CIRCUITS INDICATED BY OUTPUT DTCS
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (MULTIPLEX TILT AND TELESCOPIC ECU - MAIN BODY ECU RH)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Turn the Techstream on.
(d) Check the signal communication state of the main body ECU RH. Enter the following menus: Chassis / Tilt&Telescopic / Data List.

Tilt&Telescopic





OK:
"OK" is displayed.
NG -- REPLACE MAIN BODY ECU RH
OK -- Continue to next step.
3. READ VALUE USING TECHSTREAM (MULTIPLEX TILT AND TELESCOPIC ECU - DRIVER SEAT ECU)
(a) Check the signal communication state of the driver seat ECU on the Techstream screen.

Tilt&Telescopic





OK:
"OK" is displayed.
NG -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SEAT ECU)
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (MULTIPLEX TILT AND TELESCOPIC ECU - COMBINATION SWITCH ECU)
(a) Check the signal communication state of the combination switch ECU on the Techstream screen.

Tilt&Telescopic





OK:
"OK" is displayed.
NG -- REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU)
OK -- Continue to next step.
5. READ VALUE USING TECHSTREAM (MULTIPLEX TILT AND TELESCOPIC ECU - POWER SOURCE CONTROL ECU)
(a) Check the signal communication state of the power source control ECU on the Techstream screen.

Tilt&Telescopic





OK:
"OK" is displayed.
NG -- REPLACE POWER SOURCE CONTROL ECU
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU