B2784

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER 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, then output to the transponder key ECU assembly.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: If the transponder key ECU assembly is replaced, register the key and ECU communication ID Engine Immobiliser System.

PROCEDURE

1. READ VALUE USING TECHSTREAM
(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) Read the Data List according to the display on the Techstream.

Immobiliser (Transponder Key ECU Assembly)





OK:
On the Techstream screen, the item displays Normal according to the chart above.
NG -- CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)
OK -- REPLACE TRANSPONDER KEY ECU ASSEMBLY
2. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)
(a) Disconnect the transponder key ECU assembly connector.




(b) Disconnect the 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 ASSEMBLY (TRANSPONDER KEY AMPLIFIER POWER SOURCE)
(a) Reconnect the transponder key ECU assembly connector.




(b) Reconnect the transponder key amplifier connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






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