Inspection Procedure

INSPECT FUSE (MPX-B1, AM2, D/C CUT)
1. Remove the MPX-B1 and AM2 fuses from the passenger side J/B.
2. Remove the D/C CUT fuse from the FL block.
3. Measure the resistance of the fuse.
Standard: Below 1Ω

NG: REPLACE FUSE

OK: Go to next step

CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - BATTERY AND BODY GROUND)

Disconnect the T9 ECU connector.
Measure the resistance and voltage of the wire harness side connector.

Fig 1: Identifying T9 ECU Connector Terminals

G03003137

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard:

TRANSPONDER KEY ECU - BATTERY AND BODY GROUND - RESISTANCE TABLE

Tester Connection	Specified Condition	Condition
T9-1 (CPUB) -Body ground	Always	10 to 14V
T9-2 (IG2) - Body ground	Ignition switch OFF --> ON	0V --> 10 to 14 V
T9-14 (GND) -Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE TRANSPONDER KEY ECU ASSY