System Operation Check

WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

Trouble shooting of a power door lock system complaint begins with verification of the customer problem. If problem occurs, go to step 3. If problem does not occur, go to next step.
If problem does not occur, review conditions under which problem occurred for customer and try to duplicate those conditions. For example, if the problem occurs on rainy days or during high humidity conditions, sprinkle water onto vehicle and see if malfunction occurs. DO NOT sprinkle water directly into engine compartment or onto electronic components. Visually inspect for signs of mechanical and electrical damage. Inspect for blown fuses and damaged relays. Inspect for loose or corroded connections, damaged wiring harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any aftermarket electronic equipment is properly installed. If fault is found, repair as necessary.
Inspect the multiplex communication system and confirm that there is no trouble by the basic inspection and DTC check. See PRE-CHECK under SELF-DIAGNOSTIC under MULTIPLEX COMMUNICATION SYSTEM article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.

Determine problem symptom. See PROBLEM SYMPTOM INDEX table.

PROBLEM SYMPTOM INDEX

Symptom

Suspected Area ⁽¹⁾

All Doors Cannot Be Locked Or Unlocked

⁽²⁾⁽³⁾⁽⁴⁾⁽⁵⁾⁽⁶⁾⁽⁷⁾

Only Driver's Side Door Lock Control Does Not Operate

⁽³⁾⁽⁸⁾⁽⁷⁾

Other Doors Than Driver's Side Door Do Not Operate

⁽³⁾⁽⁵⁾⁽⁶⁾⁽⁷⁾⁽⁹⁾

Door Key Related Function Does Not Operate

⁽¹⁰⁾⁽⁷⁾

Key Confinement Prevention Function Does Not Operate

⁽¹¹⁾⁽⁷⁾⁽⁶⁾

Tailgate Opener Function Does Not Operate

⁽¹²⁾⁽¹⁰⁾⁽⁹⁾⁽⁷⁾⁽⁶⁾

Parts Of Driver Door Does Not Function

⁽¹³⁾⁽³⁾

Parts Of Passenger Door Does Not Function

⁽¹⁴⁾⁽⁴⁾

Parts Of Rear Left Door Does Not Function

⁽¹⁵⁾⁽¹⁶⁾

Parts Of Rear Right Door Does Not Function

⁽¹⁷⁾⁽¹⁸⁾

⁽¹⁾	Perform test procedures in order listed under suspected area.

⁽²⁾	Check the door lock control switch (the door lock control switch is part of the driver door ECU and passenger door ECU).

⁽³⁾	Check the driver door ECU with master switch.

⁽⁴⁾	Check the passenger door ECU with power window switch.

⁽⁵⁾	Check the multiplex communication circuit. See MULTIPLEX COMMUNICATION SYSTEM article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.

⁽⁶⁾	Check the body ECU. See BODY CONTROL SYSTEM article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.

⁽⁷⁾	Check the wire harness.

⁽⁸⁾	Check the driver's door lock motor. See DOOR LOCK MOTOR (DRIVER) under COMPONENT TESTS.

⁽⁹⁾	Check the appropriate door lock motor. See appropriate DOOR LOCK MOTOR under COMPONENT TESTS .

⁽¹⁰⁾	Check the appropriate door key lock and unlock switch. See appropriate DOOR KEY LOCK & UNLOCK SWITCH under COMPONENT TESTS .

⁽¹¹⁾	Check the appropriate door unlock detection switch. See appropriate DOOR UNLOCK DETECTION SWITCH under COMPONENT TESTS .

⁽¹²⁾	Check the tailgate door opener switch. The tailgate can be locked and unlocked together with the side doors by means of the power door lock switch, which is part of the driver door ECU and passenger door ECU.

⁽¹³⁾	Check the driver door power source circuit. See POWER SOURCE CIRCUIT (DRIVER DOOR) under CIRCUIT TESTS.

⁽¹⁴⁾	Check the passenger door power source circuit. See POWER SOURCE CIRCUIT (PASSENGER DOOR) under CIRCUIT TESTS.

⁽¹⁵⁾	Check the rear left door power source circuit. See POWER SOURCE CIRCUIT (REAR LEFT DOOR) under CIRCUIT TESTS.

⁽¹⁶⁾	Check the rear left door ECU.

⁽¹⁷⁾	Check the rear right door power source circuit. See POWER SOURCE CIRCUIT (REAR RIGHT DOOR) under CIRCUIT TESTS.

⁽¹⁸⁾	Check the rear right door ECU.

Inspect the circuits of the power door lock system. See CIRCUIT TESTS .
After repairs have been completed, confirm that problem has been eliminated. Operate the system under same conditions recorded for original complaint. If problem is no longer present, repair has corrected problem. If problem is still present, further diagnosis and repair is required.