Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FRONT NO. 2 SPEAKER ASSEMBLY LH

Disconnect the D15 speaker connector.

Fig 1: Identifying D15 Speaker Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE: Do not remove the speaker.

Measure the resistance of the speaker.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
1 - 2	Approx. 5.4 Ω

NG: REPLACE FRONT N O. 2 SPEAKER ASSEMBLY LH

OK: Go to next step

CHECK WIRE HARNESS (NAVIGATION AMPLIFIER - NAVIGATION ECU AND FRONT NO. 2 SPEAKER LH)

Disconnect the N6 amplifier connector.

Fig 2: Identifying N6 Amplifier Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the N3 ECU connector.
Disconnect the D15 speaker connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
N6-4 (NAVI) - N3-15 (MUT2)	Below 1 Ω
N6-10 (NAV+) - N3-2 (AUO+)	Below 1 Ω
N6-9 (NAV-) - N3-11 (AUO-)	Below 1 Ω
N6-1 (SP+) - D15-2	Below 1 Ω
N6-6 (SP-) - D15-2	Below 1 Ω
N6-4 (NAVI) - Body ground	10 kΩ or higher
N6-10 (NAV+) - Body ground	10 kΩ or higher
N6-9 (NAV-) - Body ground	10 kΩ or higher
N6-1 (SP+) - Body ground	10 kΩ or higher
N6-6 (SP-) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE NAVIGATION ECU