B2621
STEERING COLUMN: POWER TILT AND POWER TELESCOPIC STEERING COLUMN SYSTEM: B2621: Communication Interruption
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 (periodic 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 (MULTIPLEX COMMUNICATION SYSTEM)
(a) Check if multiplex communication system 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 main body ECU communication stop malfunction in the multiplex communication system.
* DTC B1210 indicates a power source control ECU communication stop malfunction in the multiplex communication system.
* DTC B1272 indicates a power seat ECU communication stop malfunction in the multiplex communication system.
* DTC B1278 indicates a combination switch ECU communication stop malfunction in the multiplex communication system.
E -- READ VALUE USING TECHSTREAM (POWER SOURCE CONTROL ECU COMMUNICATION SIGNAL)
D -- READ VALUE USING TECHSTREAM (COMBINATION SWITCH ECU COMMUNICATION SIGNAL)
C -- READ VALUE USING TECHSTREAM (DRIVER SEAT ECU COMMUNICATION SIGNAL)
B -- READ VALUE USING TECHSTREAM (MAIN BODY ECU RH (COWL SIDE J/B RH) COMMUNICATION SIGNAL)
A -- GO TO MULTIPLEX COMMUNICATION SYSTEM How to Proceed With Troubleshooting
2. READ VALUE USING TECHSTREAM (MAIN BODY ECU RH (COWL SIDE J/B RH) COMMUNICATION SIGNAL)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Check the signal communication state of the main body ECU RH (cowl side junction block RH). Enter the following menus: Chassis / Tilt&Telescopic / Data List.
Tilt&Telescopic
OK:
"OK" is displayed.
NG -- REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Removal
3. READ VALUE USING TECHSTREAM (DRIVER SEAT ECU COMMUNICATION SIGNAL)
(a) Check the signal communication state of the front power seat switch LH (position control ECU) on the Techstream. Enter the following menus: Chassis / Tilt&Telescopic / Data List.
Tilt&Telescopic
OK:
"OK" is displayed.
NG -- REPLACE FRONT POWER SEAT SWITCH LH (POSITION CONTROL ECU) Removal
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Removal
4. READ VALUE USING TECHSTREAM (COMBINATION SWITCH ECU COMMUNICATION SIGNAL)
(a) Check the signal communication state of the combination switch ECU on the Techstream. Enter the following menus: Chassis / Tilt&Telescopic / Data List.
Tilt&Telescopic
OK:
"OK" is displayed.
NG -- REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU) Removal
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Removal
5. READ VALUE USING TECHSTREAM (POWER SOURCE CONTROL ECU COMMUNICATION SIGNAL)
(a) Check the signal communication state of the power source control ECU on the Techstream. Enter the following menus: Chassis / Tilt&Telescopic / Data List.
Tilt&Telescopic
OK:
"OK" is displayed.
NG -- REPLACE POWER SOURCE CONTROL ECU Removal
OK -- REPLACE MULTIPLEX TILT AND TELESCOPIC ECU Removal