Power Door Lock Control System
DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: 41: Body ECU Switch Circuit Diagnosis
DTC 41 - Body ECU Switch Circuit Diagnosis
DESCRIPTION
This DTC notifies how the switch works as follows:
If the DTC is output when not operating the switch, it means the switch is ON (OFF) or stuck. If the DTC is not output when operating the switch, switch contact has failed. When something wrong is found by this diagnosis, inspect each switch. Replace the switch if there is a problem or check the body ECU and wire harness.
*: For vehicles with theft deterrent system
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE)
(a) Move the room light switch to the DOOR position and open the driver side door. Then check that the room light turns ON.
OK:
Room light turns ON.
OK -- CHECK FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (PASSENGER SIDE)
NG -- Continue to next step.
2. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (DRIVER SIDE)
(a) Remove the courtesy light switch.
(b) Measure the resistance of the switch.
Standard resistance:
NG -- REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
3. CHECK WIRE HARNESS (DRIVER SIDE COURTESY LIGHT SWITCH - BODY ECU)
(a) Disconnect the D5 switch connector.
(b) Disconnect the B8 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (PASSENGER SIDE)
(a) Move the room light switch to the DOOR position and open the passenger side door. Then check that the room light turns ON.
OK:
Room light turns ON.
NG -- CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (DOOR CONTROL SWITCH)
NG -- Continue to next step.
5. INSPECT FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY (PASSENGER SIDE)
(a) Remove the courtesy light switch.
(b) Measure the resistance of the switch.
Standard resistance:
NG -- REPLACE FRONT DOOR COURTESY LIGHT SWITCH ASSEMBLY
OK -- Continue to next step.
6. CHECK WIRE HARNESS (PASSENGER SIDE COURTESY LIGHT SWITCH - BODY ECU)
(a) Disconnect the D6 switch connector.
(b) Disconnect the B7 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (DOOR CONTROL SWITCH)
(a) For the door control switch on the power window regulator master switch, check that pressing LOCK locks all the doors and pressing UNLOCK unlocks all the doors.
OK:
All doors lock/unlock.
OK -- CHECK DOOR CONTROL SWITCH ASSEMBLY
NG -- Continue to next step.
8. INSPECT POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY (DOOR CONTROL SWITCH)
(a) Measure the resistance of the door control switch.
Standard resistance:
NG -- REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY
OK -- Continue to next step.
9. CHECK WIRE HARNESS (MASTER SWITCH - INSTRUMENT PANEL J/B AND BODY GROUND)
(a) Disconnect the D8 switch connector.
(b) Disconnect the 2K J/B connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK DOOR CONTROL SWITCH ASSEMBLY
(a) For the door control switch on the passenger side, check that pressing LOCK locks all the doors and pressing UNLOCK unlocks all the doors.
OK:
All doors lock/unlock.
OK -- INSPECT SECURITY COURTESY SWITCH (ENGINE HOOD COURTESY SWITCH)
NG -- Continue to next step.
11. INSPECT DOOR CONTROL SWITCH ASSEMBLY
(a) Measure the resistance of the switch.
Standard resistance:
NG -- REPLACE DOOR CONTROL SWITCH ASSEMBLY
OK -- Continue to next step.
12. CHECK WIRE HARNESS (DOOR CONTROL SWITCH - INSTRUMENT PANEL J/B AND BODY GROUND)
(a) Disconnect the D9 switch connector.
(b) Disconnect the 2J J/B connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
13. INSPECT SECURITY COURTESY SWITCH (ENGINE HOOD COURTESY SWITCH)
(a) Remove the courtesy switch from the hood lock.
(b) Measure the resistance of the switch.
Standard resistance:
NG -- REPLACE SECURITY COURTESY SWITCH
OK -- Continue to next step.
14. CHECK WIRE HARNESS (SECURITY COURTESY SWITCH - BODY ECU AND BODY GROUND)
(a) Disconnect the E3 switch connector.
(b) Disconnect the B9 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
15. CHECK LUGGAGE COMPARTMENT DOOR LOCK ASSEMBLY (LUGGAGE COMPARTMENT DOOR COURTESY SWITCH)
(a) Open the luggage compartment door. Then check that the luggage compartment door light turns ON.
OK:
Luggage compartment door light turns ON.
OK -- CHECK FRONT SEAT INNER BELT ASSEMBLY LH (BUCKLE SWITCH)
NG -- Continue to next step.
16. INSPECT LUGGAGE COMPARTMENT DOOR LOCK ASSEMBLY (LUGGAGE COMPARTMENT DOOR COURTESY SWITCH)
(a) Measure the resistance of the switch.
Standard resistance:
NG -- REPLACE LUGGAGE COMPARTMENT DOOR LOCK ASSEMBLY
OK -- Continue to next step.
17. CHECK WIRE HARNESS (LUGGAGE COMPARTMENT DOOR LOCK - BODY ECU)
(a) Disconnect the L3 switch connector.
(b) Disconnect the B7 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
18. CHECK FRONT SEAT INNER BELT ASSEMBLY LH (BUCKLE SWITCH)
(a) Measure the voltage of the ECU connector.
Standard voltage:
OK -- CHECK FRONT DOOR LOCK ASSEMBLY LH (DOOR LOCK AND UNLOCK SWITCH AND POSITION SWITCH)
NG -- Continue to next step.
19. INSPECT FRONT SEAT INNER BELT ASSEMBLY LH (BUCKLE SWITCH)
(a) Measure the resistance of the switch.
Standard resistance:
NG -- REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
OK -- Continue to next step.
20. CHECK WIRE HARNESS (FRONT SEAT INNER BELT LH - BODY ECU AND BODY GROUND)
(a) Disconnect the B10 switch connector.
(b) Disconnect the B8 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
21. CHECK FRONT DOOR LOCK ASSEMBLY LH (DOOR LOCK AND UNLOCK SWITCH AND POSITION SWITCH)
(a) Measure the voltage of the J/B and ECU connectors.
Standard voltage:
OK -- CHECK FRONT DOOR LOCK ASSEMBLY RH (POSITION SWITCH)
NG -- Continue to next step.
22. INSPECT FRONT DOOR LOCK ASSEMBLY LH (DOOR LOCK AND UNLOCK SWITCH AND POSITION SWITCH)
(a) Measure the resistance of the door lock and unlock switch and position switch.
Standard resistance:
Door lock and unlock switch
Position switch
NG -- REPLACE FRONT DOOR LOCK ASSEMBLY LH
OK -- Continue to next step.
23. CHECK WIRE HARNESS (FRONT DOOR LOCK LH - BODY ECU AND BODY GROUND)
(a) Disconnect the D7 lock connector.
(b) Disconnect the B8 ECU connector.
(c) Disconnect the 2K J/B connector.
(d) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
24. CHECK FRONT DOOR LOCK ASSEMBLY RH (POSITION SWITCH)
(a) Measure the voltage of the ECU connector.
Standard voltage:
OK -- INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY
NG -- Continue to next step.
25. INSPECT FRONT DOOR LOCK ASSEMBLY RH (POSITION SWITCH)
(a) Measure the resistance of the position switch.
Standard resistance:
NG -- REPLACE FRONT DOOR LOCK ASSEMBLY RH
OK -- Continue to next step.
26. CHECK WIRE HARNESS (FRONT DOOR LOCK RH - BODY ECU AND BODY GROUND)
(a) Disconnect the D10 lock connector.
(b) Disconnect the B7 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
27. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY
(a) Check that the headlight dimmer switch operates normally.
OK:
Headlight dimmer switch operates normally.
NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- Continue to next step.
28. CHECK WIRE HARNESS (HEADLIGHT DIMMER SWITCH - BODY ECU AND BODY GROUND)
(a) Check that the wire harness is normal.
OK:
Wire harness is normal.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMMBLY (BODY ECU)