B2784

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2784: Antenna Coil Open / Short

DTC B2784 - Antenna Coil Open / Short

DESCRIPTION

The transponder key coil receives key code signals from key's transponder chip. The coil is built into the transponder key amplifier, which amplifies the key code signals and output the signals to the transponder key ECU.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (TRANSPONDER KEY COIL)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON with the key that cannot start the engine.
(c) On the Techstream, enter the following menus: Body Electrical / Immobiliser / Data List / Antenna Coil Status. Read the values.

Transponder key ECU assembly





OK:
"Normal" (Transponder key coil is normal) appears on the screen.
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
NG -- Continue to next step.

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




(a) Disconnect the T10 ECU connector.
(b) Disconnect the T9 amplifier connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:





(d) Reconnect the ECU connector.
(e) Reconnect the amplifier connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE TRANSPONDER KEY AMPLIFIER