Lock Switch Circuit: Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE USING TECHSTREAM

Connect Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Enter the following menus: Body Electrical / Smart Key / Data List.

Read the Data List according to the display on the tester.

SMART KEY:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
D-Door Trigger Switch	Lock switch / ON or OFF	ON: Lock switch is pushed OFF: Lock switch is not pushed	-
P-Door Trigger Switch	Lock switch / ON or OFF	ON: Lock switch is pushed OFF: Lock switch is not pushed	-
Dr-Door Trigger Switch	Lock switch rear LH / ON or OFF	ON: Lock switch is pushed OFF: Lock switch is not pushed	-
Pr- Door Trigger Switch	Lock switch rear RH / ON or OFF	ON: Lock switch is pushed OFF: Lock switch is not pushed	-

On the tester screen, each item changes between ON and OFF according to the chart above.

OK → PROCEED TO PROBLEM SYMPTOMS TABLE NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG: Go to next step

INSPECT LOCK SWITCH

Remove the outside handle.

Fig 1: Identifying Lock Switch Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the connectors.

Measure the resistance according to the value(s) in the table below.

Resistance

Tester Connection	Condition	Specified Condition
W2-1 (TRG-) - W2-3 (TRG+)	Lock switch not pushed → Pushed	10 kΩ or higher → Below 1 Ω
V2-1 (TRG-) - V2-3 (TRG+)
Y2-1 (TRG-) - Y2-3 (TRG+)
X2-1 (TRG-) - X2-3 (TRG+)

NG → REPLACE OUTSIDE HANDLE

OK: Go to next step

CHECK WIRE HARNESS (CERTIFICATION ECU - LOCK SWITCH)

Disconnect the D39 and D40 ECU connectors.

Fig 2: Identifying Certification ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Fig 3: Identifying Lock Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Resistance

Tester Connection	Condition	Specified Condition
D39-3 (TSW1) - W2-3 (TRG+)	Always	Below 1 Ω
D39-4 (TSW2) - V2-3 (TRG+)	Always	Below 1 Ω
D40-25 (TSW3) - Y2-3 (TRG+)	Always	Below 1 Ω
D40-26 (TSW4) - X2-3 (TRG+)	Always	Below 1 Ω
D39-3 (TSW1) - Body ground	Always	10 kΩ or higher
D39-4 (TSW2) - Body ground	Always	10 kΩ or higher
D40-25 (TSW3) - Body ground	Always	10 kΩ or higher
D40-26 (TSW4) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK WIRE HARNESS (DOOR OSCILLATOR - LOCK SWITCH)

Disconnect the door oscillator connector.

Fig 4: Identifying Door Oscillator Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Fig 5: Identifying Lock Switch Connector Terminals

Resistance

Tester Connection	Condition	Specified Condition
W1-9 (TRG-) - W2-1 (TRG-)	Always	Below 1 Ω
V1-9 (TRG-) - V2-1 (TRG-)	Always	Below 1 Ω
Y1-9 (TRG-) - Y2-1 (TRG-)	Always	Below 1 Ω
X1-9 (TRG-) - X2-1 (TRG-)	Always	Below 1 Ω
W1-9 (TRG-) - Body ground	Always	10 kΩ or higher
V1-9 (TRG-) - Body ground	Always	10 kΩ or higher
Y1-9 (TRG-) - Body ground	Always	10 kΩ or higher
X1-9 (TRG-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → PROCEED TO PROBLEM SYMPTOMS TABLE NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE