Speaker Circuit (Independent Amplifier) (to 12/2010)

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Speaker Circuit
- Speaker Circuit

DESCRIPTION

for 12 Speakers:

* If there is a short in a speaker circuit, the stereo component amplifier assembly detects the short and stops output to the speakers.

* Thus sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly or speakers.

* If a short is detected in a speaker circuit, no sound can be heard from the speakers.

for 9 Speakers:

* If there is a short in this circuit, the radio receiver assembly detects it and stops output to the speakers.

* Thus sound cannot be heard from the speakers even if there is no malfunction in the radio receiver assembly or speakers.

* If a short is detected in a speaker circuit, no sound can be heard from the speakers.

WIRING DIAGRAM

1. for 12 Speakers









2. for 9 Speakers









INSPECTION PROCEDURE

PROCEDURE

1. CONFIRM MODEL

Result:





B -- CHECK HARNESS AND CONNECTOR
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR

(a) Disconnect the connectors from the stereo component amplifier assembly and speakers.

(b) Measure the resistance between each of the front No. 2 speakers and the stereo component amplifier assembly to check for an open circuit in the wire harness.

Standard Resistance:





(c) Measure the resistance between each of the front No. 2 speakers and the front No. 1 speakers to check for an open circuit in the wire harness.

Standard Resistance:





(d) Measure the resistance between each of the rear No. 2 speakers and the stereo component amplifier assembly to check for an open circuit in the wire harness.

Standard Resistance:





(e) Measure the resistance between each of the rear speakers and the rear No. 2 speakers to check for an open circuit in the wire harness.

Standard Resistance:





(f) Measure the resistance between each of the roof speakers and the stereo component amplifier assembly to check for an open circuit in the wire harness.

Standard Resistance:





(g) Measure the resistance between the rear stereo component speaker and the stereo component amplifier assembly to check for an open circuit in the wire harness.

Standard Resistance:





(h) Measure the resistance between the front No. 3 speaker and the stereo component amplifier assembly to check for an open circuit in the wire harness.

Standard Resistance:





(i) Measure the resistance between the stereo component amplifier assembly and body ground to check for a short circuit in the wire harness.

Standard Resistance:





(j) Measure the resistance between each of the front No. 1 speakers and body ground to check for a short circuit in the wire harness.

Standard Resistance:





(k) Measure the resistance between each of the rear speakers and body ground to check for a short circuit in the wire harness.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT FRONT NO. 1 SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE FRONT NO. 1 SPEAKER Removal
OK -- Continue to next step.

4. INSPECT FRONT NO. 2 SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE FRONT NO. 2 SPEAKER Removal (to 12/2010)
OK -- Continue to next step.

5. REPLACE FRONT NO. 2 SPEAKER

(a) Check that the malfunction disappears when a known good speaker is installed Removal (to 12/2010).

OK:

Malfunction disappears.

HINT
* Connect all the connectors to the front No. 2 speakers that were disconnected.
* When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
* Perform the above inspection on both LH and RH sides.

NG -- INSPECT REAR SPEAKER

OK -- END (FRONT NO. 2 SPEAKER WAS DEFECTIVE)

6. INSPECT REAR SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE REAR SPEAKER Removal
OK -- Continue to next step.

7. INSPECT REAR NO. 2 SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE REAR NO. 2 SPEAKER Removal
OK -- Continue to next step.

8. REPLACE REAR NO. 2 SPEAKER

(a) Check that the malfunction disappears when a known good speaker is installed Removal.

OK:

Malfunction disappears.

HINT
* Connect all the connectors to the rear No. 2 speakers that were disconnected.
* When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
* Perform the above inspection on both LH and RH sides.

NG -- INSPECT ROOF SPEAKER

OK -- END (REAR NO. 2 SPEAKER WAS DEFECTIVE)

9. INSPECT ROOF SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE ROOF SPEAKER Removal (to 12/2010)
OK -- Continue to next step.

10. INSPECT REAR STEREO COMPONENT SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE REAR STEREO COMPONENT SPEAKER Removal (to 12/2010)
OK -- Continue to next step.

11. INSPECT FRONT NO. 3 SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE FRONT NO. 3 SPEAKER Removal

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table (to 12/2010)

12. CHECK HARNESS AND CONNECTOR

(a) Disconnect the connectors from the radio receiver assembly and speakers.

(b) Measure the resistance between each of the front No. 2 speakers and the radio receiver assembly to check for an open circuit in the wire harness.

Standard Resistance:





(c) Measure the resistance between each of the front No. 2 speakers and the front No. 1 speakers to check for an open circuit in the wire harness.

Standard Resistance:





(d) Measure the resistance between the front No. 3 speaker and the radio receiver assembly to check for an open circuit in the wire harness.

Standard Resistance:





(e) Measure the resistance between each of the rear No. 2 speakers and the radio receiver assembly to check for an open circuit in the wire harness.

Standard Resistance:





(f) Measure the resistance between each of the rear speakers and the rear No. 2 speakers to check for an open circuit in the wire harness.

Standard Resistance:





(g) Measure the resistance between the radio receiver assembly and body ground to check for a short circuit in the wire harness.

Standard Resistance:





(h) Measure the resistance between each of the front No. 1 speakers and body ground to check for a short circuit in the wire harness.

Standard Resistance:





(i) Measure the resistance between each of the rear speakers and body ground to check for a short circuit in the wire harness.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

13. INSPECT FRONT NO. 1 SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE FRONT NO. 1 SPEAKER Removal
OK -- Continue to next step.

14. INSPECT FRONT NO. 2 SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE FRONT NO. 2 SPEAKER Removal (to 12/2010)
OK -- Continue to next step.

15. REPLACE FRONT NO. 2 SPEAKER

(a) Check that the malfunction disappears when a known good speaker is installed Removal (to 12/2010).

OK:

Malfunction disappears.

HINT
* Connect all the connectors to the front No. 2 speakers that were disconnected.
* When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
* Perform the above inspection on both LH and RH sides.

NG -- INSPECT REAR SPEAKER

OK -- END (FRONT NO. 2 SPEAKER WAS DEFECTIVE)

16. INSPECT REAR SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE REAR SPEAKER Removal
OK -- Continue to next step.

17. INSPECT REAR NO. 2 SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE REAR NO. 2 SPEAKER Removal
OK -- Continue to next step.

18. REPLACE REAR NO. 2 SPEAKER

(a) Check that the malfunction disappears when a known good speaker is installed Removal.

OK:

Malfunction disappears.

HINT
* Connect all the connectors to the rear No. 2 speakers that were disconnected.
* When there is a possibility that either the right or left front speaker is defective, inspect by interchanging the right one with the left one.
* Perform the above inspection on both LH and RH sides.

NG -- INSPECT FRONT NO. 3 SPEAKER

OK -- END (REAR NO. 2 SPEAKER WAS DEFECTIVE)

19. INSPECT FRONT NO. 3 SPEAKER

(a) Resistance check





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

Standard Resistance:





Text in Illustration





NG -- REPLACE FRONT NO. 3 SPEAKER Removal

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table (to 12/2010)