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.

INSPECT FUSE (ECU-B, DOME)
1. Remove the ECU-B fuse and DOME fuse from the engine room R/B.
2. Measure the resistance.
  Standard resistance: Below 1 Ω
3. Reinstall the fuses.
NG: REPLACE FUSE

OK: GO TO NEXT STEP

INSPECT THEFT WARNING ECU ASSEMBLY

Remove the theft warning ECU assembly without disconnecting the D26 connector.

Measure the voltage.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
D26-11 (+B1) - D26-16 (E)	11 to 14 V
D2G-13 (+B2) - D26-16 (E)	11 to 14 V

Fig 1: Inspecting Theft Warning ECU Assembly

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

NG: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

Disconnect the D26 theft warning ECU connector.

Measure the voltage.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
D26-11 (+B1) - Body ground	11 to 14 V
D26-13 (+B2) - Body ground	11 to 14 V

Measure the resistance.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
D26-16 (E) - Body ground	Below 1 Ω

Reconnect the theft warning ECU connector.

Fig 2: Checking Harness & Connector (Power Source)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE THEFT WARNING ECU ASSEMBLY