Entire Combination Meter does not Operate: Description

• This circuit is the power source circuit for the meter.
• This circuit provides two types of power sources; one is a constant power source mainly used as a backup power source, and the other is a power source mainly used for signal transmission. The constant power source is mainly used as a backup power source of the meter CPU, however, it is also used for communication.
• If a voltage of 12 V is not applied to terminal IG+ when the engine switch is on (IG), the indicator will not operate.

WIRING DIAGRAM 

Fig 1: Entire Combination Meter - Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. INSPECT COMBINATION METER ASSEMBLY 
   1. Disconnect the J34 connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      J34-1 (E2) - Body ground	Always	Below 1 Ω
      C34-13 (ES) - Body ground	Always	Below 1 Ω

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

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   J34-12 (IG+) - Body ground	Engine switch on (IG)	10 to 14V
   J34-23 (B) - Body ground	Always	10 to 14 V
   J34-24 (B) - Body ground	Always	10 to 14 V

   Fig 2: Identifying J34 Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK : REPLACE COMBINATION METER ASSEMBLY