Door Control Switch Circuit

DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: Door Control Switch Circuit

Door Control Switch Circuit

DESCRIPTION

When the lock side of the door control switch is pressed, continuity is established between terminal 2 (driver side) or 4 (passenger side) and terminal 1 (driver side) or 3 (passenger side) of the switch. When the unlock side of the switch is pressed, continuity is established between terminal 9 (driver side) or 2 (passenger side) and terminal 1 (driver side) or 3 (passenger side).
Terminals L1 and UL1 of the main body ECU are connected to the door control switch and door lock/unlock request signals (by door control switch operation) are input to the ECU.
The main body ECU constantly applies voltage to terminal 2 (driver side) or 4 (passenger side) of the door control switch via terminal L1. When the door control switch is operated to lock all doors, current flows from terminal L1 to terminal 2 (driver side) or 4 (passenger side). The main body ECU determines that this is door lock request signal input.
The main body ECU also applies constant voltage to terminal 9 (driver side) or 2 (passenger side) of the door control switch via terminal UL1. When the door control switch is operated to unlock the doors, current flows from terminal UL1 to terminal 9 (driver side) or 2 (passenger side). The main body ECU determines that this is door unlock request signal input.

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. INSPECT DOOR CONTROL SWITCH ASSEMBLY




(a) Inspect driver side.
(1) Remove the master switch.
(2) Measure the resistance of the door control switch.
Standard resistance:









(b) Inspect passenger side.
(1) Remove the door control switch assembly.
(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE DOOR CONTROL SWITCH OR MASTER SWITCH
OK -- Continue to next step.
2. CHECK WIRE HARNESS (DOOR CONTROL SWITCH - MAIN BODY ECU (INSTRUMENT PANEL J/B))
(a) Disconnect the door control switch connector.




(b) Disconnect the ECU (instrument panel J/B) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





*1: Driver Side
*2: Passenger Side
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE