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.

CHECK WIRE HARNESS (MULTI-DISPLAY - NAVIGATION ECU)

Disconnect the M14 display connector.
Disconnect the N4 ECU connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
M14-22 (MCO+) - N4-3 (MIC+)	Below 1 Ω
M14-23 (MCO-) - N4-5 (MIC-)	Below 1 Ω
M14-22 (MCO+) - Body ground	10 kΩ or higher
M14-23 (MCO-) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 1: Checking Wire Harness (Multi-Display - Navigation ECU)

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