Inspection Procedure

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

CHECK FOR OPEN IN CAN BUS WIRE (CERTIFICATION ECU BRANCH WIRE)

Disconnect the E29 certification ECU (smart key ECU) connector.
Measure the resistance according to the value (s) in the table below.
Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
E29-27 (CANH) - E29-28 (CANL)	Engine switch off	54 to 69 Ω

NG: REPAIR OR REPLACE CERTIFICATION ECU (SMART KEY ECU) BRANCH WIRE OR CONNECTOR (CANH, CANL)

Fig 1: Identifying Terminal CANH & CANL Of Certification ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - BATTERY AND BODY GROUND)

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E29-17 (E) - Body ground	Always	Below 1 Ω

Measure the voltage according to the value (s) in the table below.
Standard Voltage

STANDARD VOLTAGE SPECIFICATION

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying Terminal +B, IG & ACC Of Certification ECU Connector

OK: REPLACE CERTIFICATION ECU ASSEMBLY (SMART KEY ECU) (See REMOVAL )