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Power Source Circuit: Wiring Diagram

Fig 1: Power Source Circuit Wiring Diagram
G04063596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. CHECK BATTERY 
    1. Start the engine.
    2. Check the battery positive voltage.

    Standard voltage: 10 to 16 V 

    NG : CHECK AND REPAIR CHARGING SYSTEM 

    OK : Go To Next Step 

  2. CHECK SUSPENSION CONTROL ECU (IG - BODY GROUND) 
    1. Remove the suspension control ECU with connectors still connected.
    2. Turn the ignition switch ON.
    3. Measure the voltage between terminal IG of the suspension control ECU and body ground.

    Standard voltage: 9 to 14 V 

    NG : Go to step   4 

    Fig 2: Measuring Voltage Between Terminal IG Of Suspension Control ECU And Body Ground
    G04063597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go To Next Step 

  3. CHECK SUSPENSION CONTROL ECU (GND - BODY GROUND) 
    1. Remove the suspension control ECU with connectors still connected.
    2. Measure the resistance between terminal GND of the suspension control ECU and body ground.

    Standard resistance: Below 1Ω 

    OK : REPLACE SUSPENSION CONTROL ECU 

    NG : Go To Next Step 

    Fig 3: Measuring Resistance Between Terminal GND Of Suspension Control ECU And Body Ground
    G04063598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT FUSE (AHC-IG) 
    1. Remove the AHC-IG fuse from the cowl side junction bock LH.
    2. Measure the resistance of the fuse.

    Standard resistance: Below 1Ω 

    Fig 4: Identifying AHC-IG Fuse
    G04063599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE FUSE 

    OK : Go To Next Step 

  5. CHECK WIRE HARNESS (SUSPENSION CONTROL ECU - BATTERY) 

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK : REPLACE SUSPENSION CONTROL ECU 

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