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 assembly.





WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. READ VALUE USING TECHSTREAM (ANTENNA COIL STATUS)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

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

Immobiliser





OK:

On the Techstream screen, the item displays Normal according to the chart above.

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

OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal

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

(a) Disconnect the F54 transponder key ECU assembly connector.

(b) Disconnect the F55 transponder key amplifier connector.

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

Standard Resistance:





(d) Reconnect the transponder key amplifier connector.

(e) Reconnect the transponder key ECU assembly connector.

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

3. INSPECT TRANSPONDER KEY AMPLIFIER (POWER SOURCE AND GROUND)

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





Standard Voltage:





Standard Resistance:





Text in Illustration





NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal

OK -- REPLACE TRANSPONDER KEY AMPLIFIER Removal