Multiplex Communication System

DIAGNOSTIC TROUBLE CODE CHART

B1211/11 - B1273/73:

If a malfunction code is indicated during the DTC check, check the circuits listed for that code in the table proceed to the troubleshooting given for that circuit.

HINT:
- When either DTC 14 or 15 is output, the DTC of other ECU communication stop is also output. In this case, repair DTC 14 or 15 first. The following shows DTCs which are output when +B or GND short occurs on communication bus.
- DTCs 21 to 24, do not mean that the switch is abnormal. They notify how switch works.
If a DTC is not indicated when operating switch, it means failure of switch contact.
If a DTC is indicated when not opening the switch, it means that the switch is stuck.