Door Switch Circuit Check [Crew Cab]

Door Switch Circuit Check [Crew Cab]

Description

Detects door open/close condition.

Component Function Check

1. CHECK FUNCTION

With SDT

Check door switches in data list mode with SDT.






Is the inspection result normal?
YES
Door switch is OK.
NO
Refer to "Diagnosis Procedure".

Diagnosis Procedure

Regarding Wiring Diagram information, refer to [Power Door Lock System: Wiring Diagram [Crew Cab] Power Door Lock System [Crew Cab] ].

1. CHECK DOOR SWITCHES INPUT SIGNAL

With SDT

Check door switches ("DOOR SW-DR", "DOOR SW-AS", "DOOR SW-RL", "DOOR SW-RR") in data list mode with SDT. Refer to [SDT Function (BCM - DOOR LOCK)] SDT Function (BCM - Door Lock).
- When any doors are open:






- When any doors are closed:






Without SDT

Check voltage between BCM connector M18 or M19 terminals 12, 13, 47, 48 and ground.










Is the inspection result normal?
YES
Door switch circuit is OK.
NO
GO TO 2

2. CHECK BCM OUTPUT VOLTAGE

1 Turn ignition switch OFF.
2 Disconnect door switches.
3 Check voltage between BCM connector M18, M19 terminals 12, 13, 47, 48 and ground.











Is the inspection result normal?
YES
GO TO 3
NO
Replace BCM. Refer to [BCM: Removal and Installation] Removal and Replacement.

3. CHECK DOOR SWITCH CIRCUIT

1 Disconnect door switch and BCM.
2 Check continuity between door switch connector B8 (Front LH), B108 (Front RH), B18 (Rear LH), B116 (Rear RH) terminal 2 and BCM connector M18, M19 terminals 12, 13, 47 and 48.










3 Check continuity between door switch connector B8 (Front LH), B108 (Front RH), B18 (Rear LH), B116 (Rear RH) terminal 2 and ground.






Is the inspection result normal?
YES
GO TO 4
NO
Repair or replace harness.

4. CHECK DOOR SWITCHES

1 Disconnect door switch.
2 Check continuity between door switch terminals.










Is the inspection result normal?
YES
Check switch case ground condition.
NO
Replace door switch.