B2784

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

DTC 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, and output to the transponder key ECU.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Immobilizer / Data List.
(e) Read the Data List according to the display on the Techstream.

Immobilizer (Transponder Key ECU Assembly)





OK:
On the Techstream screen, the item displays Normal according to the chart above.
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 T9 ECU and T8 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




(a) Reconnect the T9 ECU and T8 amplifier connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:





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






NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK -- REPLACE TRANSPONDER KEY AMPLIFIER