Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Remote Engine Starter does not Operate

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Telematics / Telematics System / Remote Engine Starter does not Operate

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the DCM (telematics transceiver), refer to Registration.

Click here

PROCEDURE

1.

CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function)

(a) Check that the engine can be started by pressing the engine switch.

Result

Proceed to

Engine can be started.

A

Engine cannot be started.

B
B

GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function)

A

2.

REGISTRATION

HINT:

If registration is not performed after replacing any of the following parts, the remote engine start and stop will not be available.
  • Certification ECU (smart key ECU assembly)
  • DCM (telematics transceiver)

(a) Perform remote engine start and stop registration.

Click here

(b) Check if the problem symptom recurs.

Result

Proceed to

System does not return to normal.

A

System returns to normal.

B
B

END
A

3.

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Smart Access > Clear DTCs

(b) Check for DTCs.

Body Electrical > Smart Access > Trouble Codes

Result

Proceed to

DTC B2285 is not output.

A

DTC B2285 is output.

B
B

GO TO DTC B2285
A

4.

CHECK DCM (TELEMATICS TRANSCEIVER)

(a) Disconnect the DCM (telematics transceiver) connector.

*a

Front view of harness connector

(to DCM (Telematics Transceiver))

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

J157-30 (SLPD) - Body ground

Steering locked

11 to 14 V

Steering unlocked

Below 1.5 V

HINT:

The steering locks when any door is opened with the shift lever in P and the engine switch off. The steering unlocks when the engine switch is turned on (ACC).

OK

REPLACE DCM (TELEMATICS TRANSCEIVER)

NG

5.

CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - CERTIFICATION ECU [SMART KEY ECU ASSEMBLY])

(a) Disconnect the J157 DCM (telematics transceiver) connector.

(b) Disconnect the J41 certification ECU (smart key ECU assembly) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J157-30 (SLPD) - J41-23 (SLP)

Always

Below 1 Ω
OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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