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.

CHECK SPEAKER

Result:

RESULT CHART

Result	Proceed to
All speakers do not sound	A
A speaker does not sound	B

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

B: Go to next step

CHECK SPEAKER

Result:

RESULT CHART

Result	Proceed to
Front No. 1 speaker does not sound	A
Front No. 2 speaker does not sound	B
Stereo component speaker does not sound	C
Rear speaker does not sound	D
Rear No. 2 speaker does not sound	E

B: Go to step 4

C: Go to step 6

D: Go to step 8

E: Go to step 10

A: Go to next step

INSPECT FRONT NO. 1 SPEAKER ASSEMBLY
1. Check that malfunction disappears when the speaker is replaced with a normal one.
  OK:
  
  Malfunction disappears.
  
  HINT:
  - Connect all connectors to speakers.
  - If the right front or left front speaker is suspected to be malfunctioning, inspect by interchanging the right front and left front speaker.
NG: REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

OK: END

CHECK WIRE HARNESS (STEREO COMPONENT AMPLIFIER - FRONT NO. 2 SPEAKER)

Disconnect the S23 amplifier connector.

Fig 1: Identifying S23 Amplifier Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the D15 or D16 speaker connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
S23-1 (TFR+) - D16-1	Below 1 Ω
S23-14 (TFR-) - D16-2	Below 1 Ω
S23-2 (TFL+) - D15-1	Below 1 Ω
S23-15 (TFL-) - D15-2	Below 1 Ω
S23-1 (TFR+) - Body ground	10 kΩ or higher
S23-14 (TFR-) - Body ground	10 kΩ or higher
S23-2 (TFL+) - Body ground	10 kΩ or higher
S23-15 (TFL-) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

Disconnect the D15 or D16 speaker connector.

Fig 2: Identifying D15 Or D16 Speaker Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 NO. 2 SPEAKER ASSEMBLY

OK: REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

CHECK WIRE HARNESS (STEREO COMPONENT AMPLIFIER - STEREO COMPONENT SPEAKER)

Disconnect the S22 amplifier connector.

Fig 3: Identifying S22 Amplifier Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the W4 or W5 speaker connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
S22-1 (FR+) - W5-1	Below 1 Ω
S22-8 (FR-) - W5-2	Below 1 Ω
S22-2 (FL+) - W4-1	Below 1 Ω
S22-9 (FL-) - W4-2	Below 1 Ω
S22-1 (FR+) - Body ground	10 kΩ or higher
S22-8 (FR-) - Body ground	10 kΩ or higher
S22-2 (FL+) - Body ground	10 kΩ or higher
S22-9 (FL-) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

INSPECT STEREO COMPONENT SPEAKER ASSEMBLY

Disconnect the W4 or W5 speaker connector.

Fig 4: Identifying W4 Or W5 Speaker Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the speaker.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
1 - 2	Approx. 8 Ω

NG: REPLACE STEREO COMPONENT SPEAKER ASSEMBLY

OK: REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

CHECK WIRE HARNESS (STEREO COMPONENT AMPLIFIER - REAR SPEAKER)

Disconnect the S22 amplifier connector.

Fig 5: Identifying S22 Amplifier Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the R10 or R11 speaker connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
S22-3 (RR+) - R11-1	Below 1 Ω
S22-10 (RR-) - R11-2	Below 1 Ω
S22-4 (RL+) - R10-1	Below 1 Ω
S22-11 (RL-) - R10-2	Below 1 Ω
S22-3 (RR+) - Body ground	10 kΩ or higher
S22-10 (RR-) - Body ground	10 kΩ or higher
S22-4 (RL+) - Body ground	10 kΩ or higher
S22-11 (RL-) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

INSPECT STEREO COMPONENT SPEAKER ASSEMBLY

Disconnect the R10 or R11 speaker connector.

Fig 6: Identifying R10 Or R11 Speaker Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the speaker.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
1 - 2	Approx. 8 Ω

NG: REPLACE REAR SPEAKER ASSEMBLY

OK: REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

CHECK WIRE HARNESS (STEREO COMPONENT AMPLIFIER - REAR NO. 2 SPEAKER ASSEMBLY)

Disconnect the S22 amplifier connector.

Fig 7: Identifying S22 Amplifier Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the W6 speaker connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
S22-6 (WF-) - W6-1	Below 1 Ω
S22-5 (WF+) - W6-2	Below 1 Ω
S22-6 (WF-) - Body ground	10 kΩ or higher
S22-5 (WF+) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

INSPECT REAR NO. 2 SPEAKER ASSEMBLY

Disconnect the W6 speaker connector.

Fig 8: Identifying W6 Speaker Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the speaker.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
1 - 2	Approx. 8 Ω

NG: REPLACE REAR NO. 2 SPEAKER ASSEMBLY

OK: REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY