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.
Diagnosis System
- DESCRIPTION
- The power window control system data can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
- CHECK DLC3
- The ECU uses ISO 15765-4 communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
DLC3 TERMINAL REFERENCE CHARTSymbols (Terminal No.) Terminal Description Condition Specified Condition SIL (7)-SG (5) Bus "+" line During transmission Pulse generation CG (4) - Body ground Chassis ground Always Below 1 Ω SG (5) - Body ground Signal ground Always Below 1 Ω BAT (16) - Body ground Battery positive Always 10 to 14 V CANH (6) - CANL (14) CAN bus line Ignition switch OFF(1) 54 to 69 Ω CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF(1) 200 Ω or more CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF(1) 200 Ω or more CANH (6)-BAT (16) HIGH-level CAN bus line Ignition switch OFF(1) 6 kΩ or more CANL (14)-BAT (16) LOW-level CAN bus line Ignition switch OFF(1) 6 kΩ or more NOTE:(1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the door. If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
HINT:
Connect the cable of the Techstream to the DLC3, turn the ignition switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.
- If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
- If communication is still not possible when the tester is connected to another vehicle, the problem may be in the tester itself. Consult the Service Department listed in the tester's instruction service information.
- CHECK DIAGNOSIS (WITH JAM PROTECTION)
HINT:
If there is a malfunction in the pulse sensor, manually operating the power window switch will cause the power window switch light to blink.
- Turn the ignition switch on (IG).
- Manually operate the power window master switch or power window switch on each door.
- Check the blinking pattern of the AUTO light as shown in the illustration.
- If pattern (A) is displayed, check the wire harness or power window ECU.
- If pattern (B) is displayed, check the power window regulator motor or power window ECU.
- If the normal pattern is displayed, replace the power window regulator master switch.
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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.