Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System Is Reset
Probable cause:
Influence by external devices, power supply circuit malfunction, unit body malfunction
Wiring diagram:
Audio and navigation system Ref. to WIRING SYSTEM>AUDIO AND NAVIGATION SYSTEM>WIRING DIAGRAM .
- CHECK ENVIRONMENTAL CONDITION
.
Check if any external devices which emit strong electromagnetic waves and noises, such as a radio antenna, is installed inside the vehicle.
Is the check result OK?
Yes: Go to 2 .
No: Remove the external device to check the operation. If the fault is not fixed: Go to 2 .
- CHECK CONNECTOR CONNECTION
.
Check that the connector is connected to the unit.
Is the check result OK?
Yes: Go to 3 .
No: Connect the connector.
- CHECK CONNECTOR
.
Check for poor contact of connectors or terminals.
Is the check result OK?
Yes: Go to 4 .
No: Repair or replace the harness.
- CHECK POWER SUPPLY VOLTAGE
.
- Turn the ignition switch to ACC.
- Using the tester, measure the voltage between cockpit control module connector (i102) and chassis ground.NOTE: Turn the electrical parts to OFF.
Connector and terminal
(i102) No. 3 (+) - Chassis ground (-):
(i102) No. 4 (+) - Chassis ground (-):
Is the voltage 12 V or more?
Yes: Go to 8 .
No: Go to 5 .
- CHECK OPEN CIRCUIT IN HARNESS (POWER SUPPLY)
.
Using the tester, measure the voltage between cockpit control module connector (i102) and chassis ground while shaking the harness.
Connector and terminal
(i102) No. 3 (+) - Chassis ground (-):
(i102) No. 4 (+) - Chassis ground (-):
Is the voltage 12 V or more?
Yes: Go to 6 .
No: Repair or replace the open circuit of harness.
- CHECK OPEN CIRCUIT IN HARNESS (GROUND)
.
Using the tester, measure the resistance between cockpit control module connector (i102) and chassis ground while shaking the harness.
Connector and terminal
(i102) No. 7 - Chassis ground:
Is the resistance 1 Ω or less?
Yes: Go to 7 .
No: Repair or replace the open circuit of harness.
- CHECK BATTERY
.
Check the battery. Ref. to STARTING/CHARGING SYSTEMS (H4DOTC)>BATTERY . Ref. to STARTING/CHARGING SYSTEMS (H4DO)>BATTERY .
Is the check result OK?
Yes: Go to 8 .
No: Replace the cockpit control module. Ref. to ENTERTAINMENT & MONITORING>COCKPIT DISPLAY .
- CHECK UNIT OPERATION
.
- Connect all connectors.
- Turn the ignition switch to ACC and the power supply switch of the unit to ON.
Is the reset eliminated?
Yes: Currently no failure is found.
No: Go to 9 .
- CHECK SOFTWARE VERSION
.
Check the firmware of the cockpit control module.
Is the firmware the latest?
Yes: Replace the cockpit control module. Ref. to ENTERTAINMENT & MONITORING>COCKPIT DISPLAY .
No: Update the firmware to the latest and reproduce the failure, and then perform the diagnosis again.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.