Engine Immobilizer System (w/o Smart Key System)

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM (w/o Smart Key System): B2784: Antenna Coil Open / Short
B2784 - Antenna Coil Open / Short

DESCRIPTION

The transponder key coil is built into the transponder key amplifier and receives a key code signal from the transponder chip in the key. This signal is amplified by the amplifier, then it is output to the transponder key ECU assembly.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If the transponder key ECU is replaced, register the key and ECU communication ID Engine Immobilizer System (w/o Smart Key System).

PROCEDURE

1. READ VALUE ON TECHSTREAM (TRANSPONDER KEY AMPLIFIER)

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to the ON position.

(c) Turn the tester on.

(d) Select the following menu items: Body Electrical / Immobiliser / Data List.

(e) Select Antenna Coil Status in the Data List and read the tester display.

Immobiliser (Transponder Key ECU):





OK:

NORMAL (Antenna coil is normal) appears on the screen.

NG -- CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal

2. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

(a) Disconnect the transponder key ECU and transponder key amplifier connectors.





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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT TRANSPONDER KEY ECU ASSEMBLY (TRANSPONDER KEY AMPLIFIER POWER SOURCE)

(a) Reconnect the transponder key ECU and transponder key amplifier connectors.





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

Standard voltage:





NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal
OK -- Continue to next step.

4. INSPECT TRANSPONDER KEY ECU ASSEMBLY (TRANSPONDER KEY AMPLIFIER GROUND)

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





Standard resistance:





NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal

OK -- REPLACE TRANSPONDER KEY AMPLIFIER Removal