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 B1278, 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 (ECU-IG RH, MPX-B)

Remove the ECU-IG RH fuse from the main body ECU RH (cowl side junction block RH)
Remove the MPX-B fuse from the engine room relay block No. 1

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

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
ECU-IG RH fuse	Always	Below 1 Ω
MPX-B fuse	Always	Below 1 Ω

NG: REPLACE FUSE (ECU-IG RH, MPX-B)

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - 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
J26-1 (B) - Body ground	Always	11 to 14 V
J26-2 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
J26-5 (E) - Body ground	Always	Below 1 Ω

Fig 1: Identifying J26 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (WINDSHIELD WIPER SWITCH - 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
J26-6 (MPX1) - J76-12 (MPD2)	Always	Below 1 Ω
J26-7 (MPX2) - J55-7 (MPX1)	Always	Below 1 Ω

Fig 2: Identifying J26, J76 And J55 Connector Terminal

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE WINDSHIELD WIPER SWITCH (See REMOVAL )