B1221

WINDSHIELD / WINDOWGLASS: POWER WINDOW CONTROL SYSTEM: B1221: Power Window Switch Circuit on Driver Door
B1221 - Power Window Switch Circuit on Driver Door

DESCRIPTION

This DTC is output when any of the switches on the power window regulator master switch assembly is operated.

HINT
* If this DTC is output when a switch is not operated, one of the switches may be stuck.
* If this DTC is not output when a switch is operated, the switch's contact is defective.






WIRING DIAGRAM





INSEPCTION PROCEDURE

PROCEDURE

1. INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY

(a) Remove the master switch.





(b) Measure the resistance of the switch when the switch is operated.

Standard resistance:

for Driver switch
for Door control switch










NG -- REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY
OK -- Continue to next step.

2. CHECK WIRE HARNESS (MASTER SWITCH - DOOR ECU FRONT LH)





(a) Disconnect the P14 switch connector.

(b) Disconnect the D21 ECU connector.

(c) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH