Inspection Procedure

HINT

If "+B of GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1271, repair the "+B or GND short malfunction of communication bus" DTCs first (See DTC B1266 SHORT TO B+ IN INSTRUMENT PANEL SYSTEM COMMUNICATION BUS MALFUNCTION; DTC B1267 SHORT TO GND IN INSTRUMENT PANEL SYSTEM COMMUNICATION BUS MALFUNCTION  ).

1. INSPECT FUSE (DOME, MPX-B) 
   1. Remove the DOME and MPX-B fuses from the engine room relay block No 1
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      DOME fuse	Always	Below 1 Ω
      MPX-B fuse	Always	Below 1 Ω

   NG: REPLACE FUSE (DOME, MPX-B) 

   OK: Go to Next Step 

2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BATTERY AND BODY GROUND) 
   1. Disconnect the J34 connector
   2. Measure the voltage and resistance of the wire harness side connector

      Standard Voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      J34-23 (B) - Body ground	Always	11 to 14 V
      J34-24 (B) - Body ground	Always	11 to 14 V

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      J34-1 (E2) - Body ground	Always	Below 1 Ω
      J34-13 (ES) - Body ground	Always	Below 1 Ω

   Fig 1: Identifying J34 Connector Terminal
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER BATTERY AND BODY GROUND) 

   OK: Go to Next Step 

3. CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE) 
   1. Disconnect the J34, J49 and A27 connectors.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE REFERENCE
      
      

      Tester Connection	Condition	Specified Condition
      J34-18 (MPX-) - J49-3 (MPX1)	Always	Below 1 Ω
      J34-6 (MPX+) - A27-6 (MPX2)	Always	Below 1 Ω

   Fig 2: Identifying J34, J49 And A27 Connector Terminal
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: REPLACE COMBINATION METER  (See REMOVAL )