ENTRY AND START SYSTEM Room Oscillator does not Recognize Key

DESCRIPTION

If the room oscillator does not recognize key, either of the following may be the cause: 1) communication between the indoor electrical key oscillator (for front) and electrical key transmitter cannot be performed; or 2) communication between the indoor electrical key oscillator (for rear) and electrical key transmitter cannot be performed.

WIRING DIAGRAM


*a	Indoor Electrical Key Oscillator (for Front)
*b	Certification ECU
*c	Indoor Electrical Key Oscillator (for Rear)

PROCEDURE

CHECK POWER DOOR LOCK OPERATION

When the master switch assembly's door control switch is operated, check that the locked doors unlock.

Result
Result	Proceed to
Door locks operate normally	OK
Door locks do not operate normally	NG

GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

READ VALUE USING INTELLIGENT TESTER (AUTO ENTRY CANCEL SW)

Using the intelligent tester, read the Data List.

Entry & Start (Certification ECU)
Tester Display	Measurement Item/Display	Normal Condition	Diagnostic Note
Auto Entry Cancel SW	Entry function cancel / ON or OFF	Mode status is displayed	-

Result
Result	Proceed to
Entry function is OFF	A
Entry function is ON	B

PERFORM CANCELLATION OF ENTRY KEY CANCEL FUNCTION Click here

CHECK ENTRY AND START SYSTEM


*1	Engine Switch
*2	Card Key
*3	Key

Remove the battery of the electrical key transmitter.
Touch the LEXUS mark of the key or card key to the engine switch.

Check that the engine switch can be turned on (IG).

Result
Result	Proceed to
Engine switch can be turned on (IG)	A
Engine switch cannot be turned on (IG) (for 1UR-FSE)	B
Engine switch cannot be turned on (IG) (for 1UR-FE)	C

GO TO ENTRY AND START SYSTEM (for 1UR-FSE) Click here

GO TO ENTRY AND START SYSTEM (for 1UR-FE) Click here

CHECK WAVE ENVIRONMENT

Install the battery to the electrical key transmitter.
Bring the electrical key transmitter near the indoor electrical key oscillator (in center console), and perform an engine start check.

Note

If the key is brought within 0.2m (0.6 ft.) of the center console, communication is not possible.

Bring the electrical key transmitter near the indoor electrical key oscillator (in rear seat cushion), and perform an engine start check.

Note

If the key is brought within 0.2m (0.6 ft.) of the rear seat cushion, communication is not possible.

Tech Tips

When the electrical key transmitter is brought near the indoor electrical key oscillator, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.
If the inspection result is that the operation check is normal, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.

Result
Result	Proceed to
Both operation checks fail	A
Operation check is normal	B

AFFECTED BY WAVE INTERFERENCE

KEY DIAGNOSTIC MODE

*1 Inspection Point

Diagnostic mode inspection (front inside oscillator)
1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the intelligent tester on.
4. Enter the following menus:
  1. Intelligent tester - Select: Body / Entry & Start / Key Communication Check / Overhead + Front Room /
5. When the electrical key transmitter is placed on the driver seat or front passenger seat cushion, check that the wireless door lock buzzer sounds.


*1	Inspection Point

Diagnostic mode inspection (rear inside oscillator)

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester on.
Enter the following menus:
1. Intelligent tester - Select: Body / Entry & Start / Key Communication Check / Overhead + Rear Room /

When the electrical key transmitter is placed on the rear seat cushion, check that the wireless door lock buzzer sounds.

Tech Tips

If the buzzer sounds, it can be determined that the vehicle interior transmitters are operating normally.

Result
Result	Proceed to
Front and rear operation check is normal	A
Front and rear operation checks fail	B

REPLACE CERTIFICATION ECU

CHECK HARNESS AND CONNECTOR (INDOOR ELECTRICAL KEY OSCILLATOR - CERTIFICATION ECU)

Disconnect the L74 and S10 oscillator connectors.
Disconnect the L15 ECU connector.

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

Standard resistance

for Front

Tester Connection	Condition	Specified Condition
L74-1 (CLG3) - L15-11 (CLG5)	Always	Below 1 Ω
L74-3 (CLGB) - L15-12 (CG5B)	Always	Below 1 Ω
L74-1 (CLG3) - Body ground	Always	10 kΩ or higher
L74-3 (CLGB) - Body ground	Always	10 kΩ or higher

Standard resistance

for Rear

Tester Connection	Condition	Specified Condition
S10-1 (CLG4) - L15-13 (CLG6)	Always	Below 1 Ω
S10-3 (CLGB) - L15-14 (CG6B)	Always	Below 1 Ω
S10-1 (CLG4) - Body ground	Always	10 kΩ or higher
S10-3 (CLGB) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK INDOOR ELECTRICAL KEY OSCILLATOR (OPERATION)
1. Replace the indoor electrical key oscillator with a new one or normally functioning one.
2. Check that the entry function operates normally.
  
  OK
  
  Operates normally
OK
END (INDOOR ELECTRICAL KEY OSCILLATOR IS DEFECTIVE)

NG
REPLACE ELECTRICAL KEY TRANSMITTER
1. Replace the electrical key transmitter with a new one and perform the registration procedure.
NEXT
CHECK OPERATION
1. Check the operation of the entry lock function.
  
  OK
  
  Operates normally
OK
END (KEY IS DEFECTIVE)

NG
REPLACE CERTIFICATION ECU