Toyota RAV4 (XA40) 2013-2018 Service Manual: Ecu power source circuit
Description
This is the power source for the tire pressure warning ecu.
Wiring diagram
Inspection procedure
Notice:
It is necessary to register an id code after replacing the tire pressure monitor valve and/or the tire pressure warning ecu (see page tw-9).
- Inspect fuse (ecu-ig1)
- Remove the ecu-ig1 fuse from the instrument panel junction block.
- Measure the resistance of the fuse.
Standard resistance:
below 1 
- Inspect ig1 relay
- Remove the ig1 relay from the instrument panel junction block.
- Measure the resistance of the relay.
Standard resistance
- Inspect wire harness (ecu - battery and body ground)
- Disconnect the e56 ecu connector.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Measure the resistance of the wire harness side connector.
Standard resistance 
Proceed to next circuit inspection shown in problem symptoms table
Tire pressure warning light circuit
Description
If the tire pressure warning ecu detects trouble, the tire pressure warning
light turns on and tire pressure
monitor is canceled at the same time. At this time, the ecu records a dtc i ...
Tire pressure warning receiver (w/ antenna)
Components
...
Other materials:
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 generator assembly
Remove the generator assembly from the vehicl ...
Precaution
Notice:
Perform the reset memory procedures (a/t
initialization) when replacing the automatic transaxle
assembly, engine assembly or ecm (see page ax-18).
Hint:
Reset memory cannot be completed by only reconnecting
the cable to the negative (-) battery terminal.
Caution:
When using compresse ...
Unlock warning switch
Inspection
Inspect unlock warning switch assembly
Measure the resistance of the switch.
Standard resistance
If the result is not as specified, replace the switch
assembly.
Ecu power source circuit
Description
This circuit provides power to operate the transponder key ecu.
Wir ...
