B2784

ENGINE IMMOBILISER: ENGINE IMMOBILISER 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.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If the transponder key ECU is replaced, register the key and ECU communication ID.

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the tester ON.

(d) Enter the following menus: Body Electrical / Immobiliser / Data List.

(e) According to the display on tester, read the "Data List".

Immobiliser:





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 Removal

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

(a) Disconnect the E79 transponder key ECU connectors.





(b) Disconnect the E72 transponder key amplifier connector.

(c) 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 (TRANSPONDER KEY AMPLIFIER POWER SOURCE)





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

Standard voltage:





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

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

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





Standard resistance:





NG -- REPLACE TRANSPONDER KEY ECU Removal

OK -- REPLACE TRANSPONDER KEY AMPLIFIER Removal