Speaker Circuit (to 12/2010)
NAVIGATION: NAVIGATION SYSTEM: Speaker Circuit
- Speaker Circuit
DESCRIPTION
The sound signals amplified by the stereo component amplifier assembly are sent to the speakers from the stereo component amplifier assembly through this circuit.
If there is a short in this circuit, the stereo component amplifier 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 stereo component amplifier assembly or speakers.
If a short is detected in the speaker circuit, no sound can be heard from the speakers.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK HARNESS AND CONNECTOR
(a) Disconnect the E36 stereo component amplifier assembly connector.
(b) Disconnect the E37 stereo component amplifier assembly connector.
(c) Disconnect the E38 stereo component amplifier assembly connector.
(d) Disconnect the H3 and G3 front No. 1 speaker connectors.
(e) Disconnect the D1 and D43 front No. 2 speaker connectors.
(f) Disconnect the F3 front No. 3 speaker connector.
(g) Disconnect the J3 and I3 rear speaker connectors.
(h) Disconnect the J6 and I6 rear No. 2 speaker connectors.
(i) Disconnect the L15 and L13 roof speaker connectors.
(j) Disconnect the L24 rear stereo component speaker connector.
(k) 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:
(l) Measure the resistance between each of the front No. 1 speakers and the front No. 2 speakers to check for an open circuit in the wire harness.
Standard Resistance:
(m) Measure the resistance between each of the front No. 3 speaker and the stereo component amplifier assembly to check for an open circuit in the wire harness.
Standard Resistance:
(n) 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:
(o) 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:
(p) 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:
(q) Measure the resistance between each circuit of the rear stereo component speaker and the stereo component amplifier assembly to check for an open circuit in the wire harness.
Standard Resistance:
(r) Measure the resistance between each speaker 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.
2. INSPECT FRONT NO. 1 SPEAKER
(a) Resistance check
(1) Measure the resistance between the terminals of the speaker.
Standard Resistance:
NOTICE:
The speaker should not be removed to check resistance.
Text in Illustration
NG -- REPLACE FRONT NO. 1 SPEAKER Removal
OK -- Continue to next step.
3. INSPECT FRONT NO. 2 SPEAKER
(a) Resistance check
(1) Measure the resistance between the terminals of the speaker.
Standard Resistance:
NOTICE:
The speaker should not be removed to check resistance.
Text in Illustration
NG -- REPLACE FRONT NO. 2 SPEAKER Removal (to 12/2010)
OK -- Continue to next step.
4. INSPECT FRONT NO. 2 SPEAKER
(a) Check that the malfunction disappears when another speaker in good condition is installed.
OK:
Malfunction disappears.
HINT
* Connect all the connectors to the front No. 2 speaker.
* If 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 (FRONT NO. 2 SPEAKER WAS DEFECTIVE)
5. INSPECT FRONT NO. 3 SPEAKER
(a) Resistance check
(1) Measure the resistance between the terminals of the speaker.
Standard Resistance:
NOTICE:
The speaker should not be removed to check resistance.
Text in Illustration
NG -- REPLACE FRONT NO. 3 SPEAKER Removal
OK -- Continue to next step.
6. INSPECT REAR SPEAKER
(a) Resistance check
(1) Measure the resistance between the terminals of the speaker.
Standard Resistance:
NOTICE:
The speaker should not be removed to check 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 between the terminals of the speaker.
Standard Resistance:
NOTICE:
The speaker should not be removed to check resistance.
Text in Illustration
NG -- REPLACE REAR NO. 2 SPEAKER Removal
OK -- Continue to next step.
8. INSPECT REAR NO. 2 SPEAKER
(a) Check that the malfunction disappears when another speaker in good condition is installed.
OK:
Malfunction disappears.
HINT
* Connect all the connectors to the rear No. 2 speakers that were disconnected.
* If 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 the 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 between the terminals of the speaker.
Standard Resistance:
NOTICE:
The speaker should not be removed to check 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 between the terminals of the speaker.
Standard Resistance:
NOTICE:
The speaker should not be removed to check resistance.
Text in Illustration
NG -- REPLACE REAR STEREO COMPONENT SPEAKER Removal (to 12/2010)
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table (to 12/2010)