Inspection Procedure

HINT

If "B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1207, repair the "+B or GND short malfunction of communication bus" DTCs first (See DTC B1214 SHORT TO B+ IN DOOR SYSTEM COMMUNICATION BUS MALFUNCTION; DTC B1215 SHORT TO GND IN DOOR SYSTEM COMMUNICATION BUS MALFUNCTION )

INSPECT FUSE (SECURITY)

Remove the SECURITY fuse from the main body ECU LH (cowl side junction block LH)

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

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
SECURITY fuse	Always	Below 1 Ω

NG: REPLACE FUSE (SECURITY)

OK: Go to Next Step

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

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

Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
P33-1 (+B1) - Body ground	Always	11 to 14 V

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
P33-17 (E) - Body ground	Always	Below 1 Ω

Fig 1: Identifying P33 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (CERTIFICATION ECU - BATTERY AND BODY GROUND)

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)

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

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
P33-27 (MPX1) - RJ-21 (MPX1)	Always	Below 1 Ω
P33-28 (MPX2) - M7-8 (MPX2)	Always	Below 1 Ω

Fig 2: Identifying P33, RJ And M7 Connector Terminal

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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