DTC B2784: Antenna Coil Open / Short: Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

RECONFIRM DTC
1. Clear the DTC and repeat the procedure to re-check it. Refer to DTC CHECK / CLEAR .
  OK
  
  DTC is not output.
OK → END (SYSTEM IS NORMAL)

NG: Go to next step

CHECK WIRE HARNESS (CERTIFICATION ECU - ENGINE SWITCH)

Disconnect the D39 ECU connector.

Fig 1: Identifying D39 Certification ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the D21 switch connector.

Fig 2: Identifying D21 Engine Switch Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Resistance

Tester Connection	Condition	Specified Condition
D39-8 (TXCT) - D21-9 (TXCT)	Always	Below 1 Ω
D39-9 (CODE) - D21-10 (CODE)	Always	Below 1 Ω
D39-30 (VC5) - D21-14 (VC5)	Always	Below 1 Ω
D39-40 (AGND) - D21-8 (AGND)	Always	Below 1 Ω
D39-8 (TXCT) - Body ground	Always	10 kΩ or higher
D39-9 (CODE) - Body ground	Always	10 kΩ or higher
D39-30 (VC5) - Body ground	Always	10 kΩ or higher
D39-40 (AGND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

REPLACE ENGINE SWITCH (CHECK OPERATION OF ENGINE SWITCH)
1. Replace the engine switch.
2. Clear the DTC and repeat the procedure to re-check it. Refer to DTC CHECK / CLEAR .
  OK
  
  DTC is not output.
OK → END (ENGINE SWITCH IS DEFECTIVE)

NG → REPLACE CERTIFICATION ECU