Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - MULTI-DISPLAY)

Disconnect the connector from the navigation ECU N4 and multi-display M4.

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

Standard:

SPECIFIED CONDITION

Tester connection	Condition	Specified condition
R (N4) - R (M4)	Always	Below 1 Ω
G (N4) - G (M4)	Always	Below 1 Ω
B (N4) - B (M4)	Always	Below 1 Ω
SYNC (N4) - SYNC (M4)	Always	Below 1 Ω
VR (N4) - VR (M4)	Always	Below 1 Ω
VG (N4) - VG (M4)	Always	Below 1 Ω
R (N4 or M4) -Body ground	Always	10 kΩ or higher
G (N4 or M4) -Body ground	Always	10 kΩ or higher
B (N4 or M4) -Body ground	Always	10 kΩ or higher
SYNC (N4 or M4) -Body ground	Always	10 kΩ or higher
VR (N4 or M4) -Body ground	Always	10 kΩ or higher
VG (N4 or M4) -Body ground	Always	10 kΩ or higher

Fig 1: Identifying Navigation ECU Connector N4

Fig 2: Identifying Navigation Multi-Display Connector M4

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )