Toyota RAV4 Service Manual: Short in can bus lines
Description
There may be a short circuit between the can bus lines when the resistance
between terminals 6 (canh)
and 14 (canl) of the dlc3 is below 54
.

Wiring diagram


Inspection procedure
Notice:
- Turn the ignition switch off before measuring the resistances of the
main wire and the branch
wire.
- After the ignition switch is turned off, check that the key reminder
warning system and light
reminder warning system are not in operation.
- Before measuring the resistance, leave the vehicle for at least 1
minute and do not operate the
ignition switch, any switches or doors. If doors need to be opened in order
to check
connectors, open the doors and leave them open.
Hint:
Operating the ignition switch, any switches or any doors triggers related ecu
and sensor communication
with the can, which causes resistance variation.
- Check can bus lines for short circuit (dlc3 branch wire)

- Disconnect the e68 no. 2 Junction connector.
- Measure the resistance of the dlc3.
Standard resistance 

- Connect connector
- Reconnect the e68 no. 2 Junction connector.
- Check can bus lines for short circuit (no. 1 Junction connector side)

- Disconnect the a36 no. 1 Junction connector.
- Measure the resistance of the dlc3.
Standard resistance 

- Check can bus lines for short circuit (no. 1 Junction connector - no.
2 Junction connector)

- Disconnect the e68 no. 2 Junction connector.
- Measure the resistance of the wire harness side
connector.
Standard resistance

- Connect connector
- Reconnect the a36 no. 1 Junction connector.
- Reconnect the e68 no. 2 Junction connector.
- Check can bus lines for short circuit (no. 3 Junction connector, no.
4 Junction connector side)

- Disconnect the e70 no. 3 Junction connector.
- Measure the resistance of the dlc3.
Standard resistance 

- Connect connector
- Reconnect the e70 no. 3 Junction connector.

- Check can bus lines for short circuit (no. 4 Junction connector side)

- Disconnect the e69 no. 4 Junction connector.
- Measure the resistance of the dlc3.
Standard resistance 

- Check can bus lines for short circuit (no. 3 Junction connector - no.
4 Junction connector)

- Disconnect the e70 no. 3 Junction connector.
- Measure the resistance of the wire harness side
connector.
Standard resistance 


- Connect connector
- Reconnect the e69 no. 4 Junction connector.
- Check can bus lines for short circuit (no. 3 Junction connector -
center
airbag sensor assembly)

- Measure the resistance of the wire harness side connector.
Result 

- Connect connector
- Reconnect the e70 no. 3 Junction connector.

- Check can bus lines for short circuit (center airbag sensor assembly)

- Disconnect the e45 center airbag sensor connector.
- Measure the resistance of the dlc3.
Standard resistance 

Replace center airbag sensor assembly
- Check can bus lines for short circuit (no. 1 Junction connector - ecm)

- Measure the resistance of the wire harness side
connector.
Result 

- Check can bus lines for short circuit (no. 1 Junction connector - abs
and traction actuator)

- Measure the resistance of the wire harness side
connector.
Result 

Repair or replace no. 1 Junction connector
- Connect connector
- Reconnect the a36 no. 1 Junction connector.

- Check can bus lines for short circuit (ecm)

- Disconnect the a9 ecm connector.
- Measure the resistance of the dlc3.
Standard resistance 
Replace ecm
- Connect connector
- Reconnect the a36 no. 1 Junction connector.
- Check can bus lines for short circuit (abs and traction actuator)

- Disconnect the a19 abs and brake actuator (skid control
ecu) connector.
- Measure the resistance of the dlc3.
Standard resistance 

Replace abs and traction actuator (skid control ecu)
- Connect connector
- Reconnect the e70 no. 3 Junction connector.
- Check can bus lines for short circuit (no. 2 Junction connector - yaw
rate sensor)

- Disconnect the e68 no. 2 Junction connector.
- Measure the resistance of the wire harness side
connector.
Result 

- Check can bus lines for short circuit (no. 2 Junction connector -
power steering ecu)

- Measure the resistance of the wire harness side
connector.
Result

- Check can bus lines for short circuit (no. 2 Junction connector -
main body ecu)

- Measure the resistance of the wire harness side
connector.
Result 

- Check can bus lines for short circuit (no. 2 Junction connector - air
conditioning amplifier)

- Measure the resistance of the wire harness side
connector.
Result 

- Check can bus lines for short circuit (no. 2 Junction connector -
steering angle sensor)

- Measure the resistance of the wire harness side
connector.
Result 

Repair or replace no. 2 Junction connector
- Connect connector
- Reconnect the e68 no. 2 Junction connector.

- Check can bus lines for short circuit (yaw rate sensor)

- Disconnect the k6 yaw rate sensor connector.
- Measure the resistance of the dlc3.
Standard resistance 

Replace yaw rate sensor
- Connect connector
- Reconnect the e68 no. 2 Junction connector.
- Check can bus lines for short circuit (power steering ecu)

- Disconnect the e18 power steering ecu connector.
- Measure the resistance of the dlc3.
Standard resistance 

Replace power steering ecu
- Connect connector
- Reconnect the e68 no. 2 Junction connector.
- Check can bus lines for short circuit (main body ecu)

- Disconnect the e17 main body ecu connector.
- Measure the resistance of the dlc3.
Standard resistance 

Replace instrument panel junction block (main body ecu)
- Connect connector
- Reconnect the e68 no. 2 Junction connector.

- Check can bus lines for short circuit (air conditioning amplifier)

- Disconnect the e37*1 or e36*2 air conditioning amplifier
connector.
Hint:
- *1: For automatic air conditioning system.
- *2: For manual air conditioning system.
- Measure the resistance of the dlc3.
Standard resistance 

Replace air conditioning amplifier
- Connect connector
- Reconnect the e68 no. 2 Junction connector.
- Check can bus lines for short circuit (steering angle sensor)

- Disconnect the e11 steering sensor connector.
- Measure the resistance of the dlc3.
Standard resistance 

Replace steering angle sensor
- Check can bus lines for short circuit (no. 4 Junction connector - 4wd
control ecu)

Notice:
For vehicles without 4wd, go to "check can bus
lines for short circuit (no. 4 Junction
connector - combination meter ecu)".
- Measure the resistance of the wire harness side
connector.
Result 

- Check can bus lines for short circuit (no. 4 Junction connector -
combination meter ecu)

- Measure the resistance of the wire harness side
connector.
Result 

Repair or replace no. 4 Junction connector
- Connect connector
- Reconnect the e69 no. 4 Junction connector.
- Check can bus lines for short circuit (4wd control ecu)

- Disconnect the e57 4wd control ecu connector.
- Measure the resistance of the dlc3.
Standard resistance

Replace 4wd control ecu
- Connect connector
- Reconnect the e69 no. 4 Junction connector.
- Check can bus lines for short circuit (combination meter ecu)

- Disconnect the e19 combination meter ecu connector.
- Measure the resistance of the dlc3.
Standard resistance 

Replace combination meter ecu
Description
There may be an open circuit in the can main wire and / or the dlc3 branch
wire when the resistance
between terminals 6 (canh) and 14 (canl) of the dlc3 is 69 ù or more.
Wi ...
Description
There may be a short circuit between the can bus line and +b when there is
resistance between
terminals 6 (canh) and 16 (bat) or terminals 14 (canl) and 16 (bat) of the dlc3.
Wiri ...
Other materials:
Cooling fan motor
On-vehicle inspection
Inspect no. 1 Cooling fan motor
Disconnect the no. 1 Fan connector.
Connect the battery and ammeter to the no. 1 Fan
motor connector.
Check that the no. 1 Fan rotates smoothly, and then
check the reading on the ammeter.
Standard amperage ...
Diagnostic trouble code chart
Hint:
If any dtcs are displayed during the dtc check, inspect the
circuit listed for these dtcs. For details of each dtc, refer to
the page indicated in the dtc chart.
Hint:
: Warning
light comes on
X: warning light turns off (normal reset) ...
Tc and cg terminal circuit
Description
Dtc output mode is set by connecting terminals tc and cg of the dlc3.
The dtcs are displayed by blinking the srs warning light.
Hint:
Make sure that dtc b1281 has not been output. If dtc b1281 has been
output, refer to the multiplex
communication system.
When each warning ...