Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Inspection

INSPECTION

PROCEDURE

1. INSPECT ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

(a) Inspect the operation of the electrical key transmitter sub-assembly. (Type A)

(1) Remove the transmitter battery from the electrical key transmitter sub-assembly.

Click here

Click here

(2) Install a new or known good transmitter battery. Click here NOTICE: When replacing the transmitter battery, before starting work, remove static electricity that has built up in the body by touching, for example, the vehicle to prevent the electrical key transmitter sub-assembly from being damaged. HINT: If a new or known good transmitter battery is not available, first connect 2 new 1.5 V batteries in series. Then connect leads to the batteries and apply 3 V to the electrical key transmitter sub-assembly, as shown in the illustration.

(3) From outside the vehicle, approximately 1 m (3.28 ft.) from the driver door outside door handle, test the electrical key transmitter sub-assembly by pointing its key plate at the vehicle and pressing an electrical key transmitter sub-assembly switch.

OK:

The door lock can be operated via the electrical key transmitter sub-assembly.

The LED comes on more than once.

(b) Inspect the transmitter battery capacity. (Type A)

(1) Remove the transmitter battery from the electrical key transmitter sub-assembly that does not operate. Attach a lead wire (0.6 mm (0.0236 in.) in diameter or less including wire sheath) with tape or equivalent to the negative terminal.

Click here

NOTICE:

Do not wrap the lead wire around a terminal, wedge it between the terminals, or solder it. A terminal may be deformed or damaged, and the transmitter battery will not be able to be installed correctly.

(2) Carefully pull the lead wire out from the position shown in the illustration and install the previously removed transmitter battery. NOTICE: When replacing the transmitter battery, before starting work, remove static electricity that has built up in the body by touching, for example, the vehicle to prevent the electrical key transmitter sub-assembly from being damaged.

(3) Check the transmitter battery voltage. HINT: When measuring the transmitter battery voltage, while operating the lock sensor of a door handle, bring the electrical key transmitter sub-assembly within the entry operating range to perform the measurement. For the entry operating range, refer to System Description. Click here Perform the measurement when the key is at room temperature. The key sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. When this voltage is 2.1 V or less the Data List item "Key Low Battery" displays "Yes". Standard Voltage: Tester Connection Condition Specified Condition Transmitter battery positive (+) - Transmitter battery negative (-) Engine switch off, all doors closed and lock sensor touched 2.5 to 3.2 V If the result is not as specified, replace the transmitter battery.

*a GND

(c) Inspect the operation of the electrical key transmitter sub-assembly. (Type B)

(1) Remove the transmitter battery from the electrical key transmitter sub-assembly.

Click here

(2) Install a new or known good transmitter battery. Click here NOTICE: When replacing the transmitter battery, before starting work, remove static electricity that has built up in the body by touching, for example, the vehicle to prevent the electrical key transmitter sub-assembly from being damaged. HINT: If a new or known good transmitter battery is not available, first connect 2 new 1.5 V batteries in series. Then connect leads to the batteries and apply 3 V to the electrical key transmitter sub-assembly, as shown in the illustration.

(3) From outside the vehicle, approximately 1 m (3.28 ft.) from the driver door outside door handle, test the electrical key transmitter sub-assembly by pointing its key plate at the vehicle and pressing an electrical key transmitter sub-assembly switch.

OK:

The door lock can be operated via the electrical key transmitter sub-assembly.

The LED comes on more than once.

(d) Inspect the transmitter battery capacity. (Type B)

(1) Remove the transmitter battery from the electrical key transmitter sub-assembly that does not operate. Attach a lead wire (0.6 mm (0.0236 in.) in diameter or less including wire sheath) with tape or equivalent to the negative terminal.

Click here

NOTICE:

Do not wrap the lead wire around a terminal, wedge it between the terminals, or solder it. A terminal may be deformed or damaged, and the transmitter battery will not be able to be installed correctly.

(2) Carefully pull the lead wire out from the position shown in the illustration and install the previously removed transmitter battery. NOTICE: When replacing the transmitter battery, before starting work, remove static electricity that has built up in the body by touching, for example, the vehicle to prevent the electrical key transmitter sub-assembly from being damaged.

(3) Check the transmitter battery voltage. HINT: When measuring the transmitter battery voltage, while operating the lock sensor of a door handle, bring the electrical key transmitter sub-assembly within the entry operating range to perform the measurement. For the entry operating range, refer to System Description. Click here Perform the measurement when the key is at room temperature. The key sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. When this voltage is 2.1 V or less the Data List item "Key Low Battery" displays "Yes". Standard Voltage: Tester Connection Condition Specified Condition Transmitter battery positive (+) - Transmitter battery negative (-) Engine switch off, all doors closed and lock sensor touched 2.5 to 3.2 V If the result is not as specified, replace the transmitter battery.

*a GND

2. INSPECT ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY (for Card Type)

(a) Inspect the operation of the electrical key transmitter sub-assembly. (for Card Type)

(1) Remove the transmitter battery from the electrical key transmitter sub-assembly.

(2) Install a new or known good transmitter battery. HINT: If a new or known good transmitter battery is not available, connect 2 new 1.5 V batteries in series and connect leads from the batteries to the electrical key transmitter sub-assembly (for Card Type) as shown in the illustration.

(3) Hold the electrical key transmitter sub-assembly (for Card Type) facing towards the vehicle approximately 1 m (3.28 ft.) away from the driver door outside handle assembly and check that the doors lock when the lock switch on the driver door outside handle assembly is pressed.

OK:

All doors can be locked.

(b) Inspect the transmitter battery capacity. (for Card Type)

(1) Remove the transmitter battery from the electrical key transmitter sub-assembly (for Card Type) that does not operate. Attach a lead wire to the negative (-) and positive (+) sides of the transmitter battery with tape or equivalent.

NOTICE:

Do not wrap the lead wire around a terminal, wedge it between the terminals, or solder it. A terminal may be deformed or damaged, and the transmitter battery will not be able to be installed correctly.

(2) Check the transmitter battery voltage. HINT: When measuring the transmitter battery voltage, while operating the lock switch of a door handle, bring the electrical key transmitter sub-assembly (for Card Type) within the entry operation range to perform the measurement. For the entry operation range, refer to Operation Check. Standard Voltage: Tester Connection Condition Specified Condition Transmitter battery positive (+) - Transmitter battery negative (-) Engine switch off, all doors closed and lock sensor touched 2.5 to 3.2 V If the result is not as specified, replace the transmitter battery.

*a GND