Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If the certification ECU (smart key ECU assembly) is replaced, register the key (See REGISTRATION ).
If the ID code box (immobilizer code ECU) is replaced, register the ECU code and ECU communication ID (See REGISTRATION ).

CHECK FOR DTC
1. Clear the DTC (See DIAGNOSIS SYSTEM )
2. Recheck for DTC.
  OK: B2789 is not output.
NG: Go to step 2

OK: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH TROUBLESHOOTING )

CHECK HARNESS AND CONNECTOR (ID CODE BOX BATTERY VOLTAGE AND GROUND)

Disconnect the J69 connector

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

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
J69-8 (GND) - Body ground	Always	Below 1 Ω

Standard Voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
J69-1 (+B) - Body ground	Always	11 to 14 V

Fig 1: Identifying J69 Connector Terminal

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)

Disconnect the P33 connector.

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

Standard Resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
P33-10 (LIN) - J69-3 (LIN1)	Always	Below 1 Ω
P33-10 (LIN) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying P33 Connector Terminal

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

REPLACE ID CODE BOX (IMMOBILIZER CODE ECU)
1. Replace the ID code box (immobilizer code ECU) (See REMOVAL )
CHECK FOR DTC
1. Clear the DTC (See DIAGNOSIS SYSTEM )
2. Recheck for DTC
  OK: B2789 is not output.
NG: REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (See REMOVAL )

OK: END (ID CODE BOX (IMMOBILIZER CODE ECU) IS DEFECTIVE)