Toyota RAV4 Service Manual: Downhill assist control operation switch (test mode dtc)
Description
The downhill assist control switch is connected to the skid control ecu in
the abs and traction
actuator.
Dtc c1379/74 can be detected when the downhill assist control switch sends the
downhill assist control
switch signal or test mode ends. Dtc c1379/74 is output only in test mode.
Wiring diagram
Refer to downhill assist control switch circuit (see page bc-157).
Inspection procedure
Notice:
When replacing the abs and traction actuator, perform zero point
calibration (see page bc-24).
- Check wire harness (skid control ecu - body ground)
- Disconnect the a19 ecu.
- Measure the resistance of the wire harness side
connector.
Standard resistance
- Inspect downhill assist control switch
- Remove the downhill assist control switch.
- Measure the resistance of the switch.
Standard resistance
- Check wire harness (skid control ecu - downhill assist control
switch)
- Disconnect the a19 ecu connector.
- Disconnect the e31 switch connector.
- Measure the resistance of the wire harness side
connectors.
Standard resistance
Replace abs and traction actuator assembly
Stop light control relay malfunction
Description
The skid control ecu inputs the stop light switch signal and detects the
status of the brake operation.
Wiring diagram
Inspection procedure
Notice:
When replacing the abs and traction actuator, perform zero point
calibration (see page bc-24).
- Check stop light (operation)
- Check that the light illuminates when the brake pedal is
depressed, and turns off when the brake pedal is
released.
Ok
- Check wire harness (skid control ecu - battery)
- Disconnect the a19 ecu connector.
- Measure the voltage of the wire harness side connector.
Standard voltage
- Check wire harness (skid control ecu)
- Disconnect the a19 ecu connector.
- Measure the resistance of the wire harness side
connector
Standard resistance
- Perform active test by intelligent tester (stop light relay)
- Select the active test, generate a control command,
and then check that the stop light relay operates.
Ok:
the stop lights illuminate or turn off.
- Reconfirm dtc
- Clear the dtc (see page bc-47).
- Start the engine.
- Drive the vehicle at a speed of 5 km/h (3 mph) or more
for several seconds.
- Check if the same dtc is output (see page bc-47).
Result
Replace abs and traction actuator assembly
- Inspect stop light control relay (marking: brk)
- Remove the stop light control relay from the engine room
no. 1 Relay block.
- Measure the resistance of the relay.
Standard resistance
- Check wire harness (engine room no. 1 Relay block - skid control ecu
and battery)
- Remove the stop light control relay.
- Disconnect the a19 ecu connector.
- Measure the voltage of the wire harness side connector.
Standard voltage
- Measure the resistance of the wire harness side
connector.
Standard resistance
- Reconfirm dtc
- Clear the dtc (see page bc-47).
- Start the engine.
- Drive the vehicle at a speed of 5 km/h (3 mph) or more
for several seconds.
- Check if the same dtc is output (see page bc-47).
Result
Replace abs and traction actuator assembly
- Check wire harness (stop light switch - battery)
- Disconnect the a3 switch connector.
- Measure the voltage of the wire harness side connector.
Standard voltage
- Inspect stop light switch assembly
- Remove the stop light switch connector.
- Measure the resistance of the switch.
Standard resistance
- Check wire harness (stop light switch - stop light control relay)
- Disconnect the a3 switch connector.
- Remove the stop light control relay.
- Measure the resistance of the wire harness side
connectors.
Standard resistance
- Inspect stop light control relay (marking: brk)
- Remove the stop light control relay from the engine room
no. 1 Relay block.
- Measure the resistance of the relay.
Standard resistance
- Check wire harness (stop light and rear combination light - control
relay)
- Disconnect the q1, k12 and k14 light connectors.
- Remove the stop light control relay.
- Measure the resistance of the wire harness side
connectors.
Standard resistance
Check for intermittent problems
Description
The skid control ecu measures the speed of each wheel by receiving signals
from the speed sensor.
These signals are used for recognizing that all 4 wheels are operating properly. ...
Description
Inspection procedure
The skid control ecu inputs the signals from the ecm, steering angle sensor,
and yaw rate and
acceleration sensor via can communication system.
Ch ...
Other materials:
Disassembly
Remove radiator grille sub-assembly
Remove the 4 bolts and 4 nuts.
Detach the 6 claws and remove the radiator grille.
Remove no. 1 Radiator grille lower
Detach the 18 claws and remove the radiator grille.
Remove no. 2 Radiator grille lower
Detac ...
Transmitter id
Description
The tire pressure warning valve and transmitter that is installed in the
tires and wheels measures the air
pressure of the tires. The measured values are transmitted to the tire pressure
warning receiver on the
body as radio waves and then sent to the tire pressure warning ecu ...
Registration
Perform vehicle stability control system recognition in ecm
Notice:
If the vehicle has both cruise control and vsc, when
replacing ecm, perform vsc recognition as follows:
Turn the ignition switch on.
After waiting approximately 5 seconds, turn the
cruise control main switch on.
Ke ...