Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE USING TECHSTREAM (ENGINE HOOD COURTESY SWITCH)

Connect the Techstream to the DLC3.
Turn the ignition switch ON.
Turn the tester ON.

Select the item below in the Data List and read the display on the tester.

Theft Warning ECU

THEFT WARNING ECU TABLE

Item	Measurement Item/Display (Range)	Normal Condition
Hood Courtesy Switch	Engine hood courtesy switch signal/ON or OFF	ON: Engine hood is OPEN OFF: Engine hood is CLOSED

NG: Go to step 2

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

INSPECT HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH)

Disconnect the A18 courtesy switch connector.

Check the resistance of the engine hood courtesy switch.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
1-2	Lock (OFF)	10 kΩ or higher
1-2	Unlock (ON)	Below 1 Ω

Reconnect the courtesy switch connector.

Fig 1: Identifying Lock & Unlock Position Of Hood Lock Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HOOD LOCK ASSEMBLY

OK: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR HOOD COURTESY SWITCH) (THEFT WARNING ECU ASSEMBLY - ENGINE

Disconnect the D26 theft warning ECU and A18 engine hood courtesy switch connectors.

Measure the resistance.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
D26-4 (DSWH) - A18-1	Below 1 Ω
D26-4 (DSWH) - Body ground	10 kΩ or higher

Reconnect the theft warning ECU and engine hood courtesy switch connectors.

Fig 2: Checking Harness & Connector (Theft Warning ECU Assembly - Engine Hood Courtesy Switch)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (ENGINE HOOD COURTESY SWITCH - BODY GROUND)

Disconnect the A18 engine hood courtesy switch connector.

Measure the resistance.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
A18-2 - Body ground	Below 1 Ω

Reconnect the engine hood courtesy switch connector.

Fig 3: Checking Harness & Connector (Engine Hood Courtesy Switch - Body Ground)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE THEFT WARNING ECU ASSEMBLY