Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FUSE (DOME, ACC)
1. Disconnect the DOME fuse from the engine room junction block.
2. Disconnect the ACC fuse from the driver side junction block.
3. Measure the resistance of the fuses.
  Standard resistance: Below 1 Ω
NG: REPLACE FUSE

OK: Go to Next Step

CHECK WIRE HARNESS (NAVIGATION ECU - BATTERY AND BODY GROUND)

Disconnect the N3 ECU connector.

Measure the voltage and resistance of the wire harness side connector.

Standard voltage

VOLTAGE CHART

Tester Connection	Condition	Specified Condition
N3-1 (+B) - Body ground	Always	10 to 14 V
N3-13 (ACC) - Body ground	Power switch ON (ACC)	10 to 14 V

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
N3-15 (GND1) - Body ground	Below 1 Ω

Fig 1: Identifying N3 ECU Connector

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE