Toyota RAV4 manuals

Toyota RAV4 Service Manual: Back-up power source circuit

Description

This is the back-up power source circuit for the air conditioning amplifier. Power is supplied even when the ignition switch is turned off and is used for functions such as the diagnostic trouble code memory.

wiring diagram

Toyota RAV4. Back-up power source circuit


Inspection procedure

  1. Inspect fuse (ecu-b2)

  1. Remove the ecu-b2 fuse from the engine room no. 2 Relay block.
  2. Measure the resistance of the fuse.

Standard resistance: below 1




  1. Check wire harness (air conditioning amplifier - battery)

Toyota RAV4. Check wire harness (air conditioning amplifier - battery)


  1. Disconnect the e37 amplifier connector.
  2. Measure the voltage of the wire harness side connector.

Standard voltage




  1. Check wire harness (air conditioning amplifier - body ground)

Toyota RAV4. Check wire harness (air conditioning amplifier - body ground)


  1. Disconnect the e37 amplifier connector.
  2. Measure the resistance of the wire harness side connector.

Standard resistance




Proceed to next circuit inspection shown in problem symptoms table

Ig power source circuit
Description This is the main power source supplied to the air conditioning amplifier when the ignition switch is on (ig). This power source is used for operating components, such as the air cond ...

Air conditioning system (for manual air conditioning system)
...

Other materials:

Customer problem analysis
Hint: In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem an ...

Diagnosis system
Description When troubleshooting obd ii (on-board diagnostics) vehicles, the intelligent tester (complying with sae j1987) must be connected to the dlc3 (data link connector 3) of the vehicle. Various data in the vehicle's ecm (engine control module) can be then read. Obd ii regulations ...

Power outlet socket
Components Removal Disconnect cable from negative battery terminal Caution: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation. Remove switch base (see page ip-21) Remove power o ...

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