DTC 74-40
AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM (w/o Navigation System without Multi-display): 74-40: Short in Speaker Circuit
74-40 - Short in Speaker Circuit
DESCRIPTION
This DTC is stored when a malfunction occurs in the speakers.
* *1: w/ Manual (SOS) Switch
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY
(a) Disconnect P44 and P28 stereo component amplifier assembly connectors.
(b) Clear the DTCs and recheck for DTCs.
(c) Check if DTC 74-40 is output.
OK:
DTC 74-40 is not output.
NG -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal
OK -- Continue to next step.
2. CHECK OPERATION
(a) Reconnect P28 stereo component amplifier assembly connector.
(b) Check if DTC 74-40 is output.
OK:
DTC 74-40 is not output.
NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR
(a) Disconnect P44 stereo component amplifier assembly connector.
(b) Disconnect J114 DCM (telematics transceiver) connector.*1
*1: w/ Manual (SOS) Switch
(c) Disconnect L1, M13, N4*1, N6*1, O4*1, O6*1, N3*1, O3*1, N11*2 and O11*2 speaker connectors.
*1: for 13 Speakers
*2: for 8 Speakers
(d) Measure the resistance between the stereo component amplifier assembly and body ground to check for a short circuit in the wire harness.
Standard Resistance:
*1: for 13 Speakers
(e) w/ Manual (SOS) Switch:
Measure the resistance between the front No. 1 speaker RH and body ground to check for a short circuit in the wire harness.
Standard Resistance:
(f) for 13 Speakers:
Measure the resistance between each of the rear No. 2 speakers and body ground to check for a short circuit in the wire harness.
Standard Resistance:
(g) Measure the resistance between the front No. 1 speaker LH and the stereo component amplifier assembly to check for an open circuit in the wire harness.
Standard Resistance:
(h) w/o Manual (SOS) Switch:
Measure the resistance between the front No. 1 speaker RH and the stereo component amplifier assembly to check for an open circuit in the wire harness.
Standard Resistance:
(i) w/ Manual (SOS) Switch:
Measure the resistance between the stereo component amplifier assembly and the DCM (telematics transceiver) to check for an open circuit in the wire harness.
Standard Resistance:
(j) w/ Manual (SOS) Switch:
Measure the resistance between the front No. 1 speaker RH and the DCM (telematics transceiver) to check for an open circuit in the wire harness.
Standard Resistance:
(k) Measure the resistance between each of the rear speakers and the stereo component amplifier assembly to check for an open circuit in the wire harness.
Standard Resistance:
for 13 Speakers
for 8 Speakers
(l) for 13 Speakers:
Measure the resistance between each of the rear No. 3 speakers and the stereo component amplifier assembly to check for an open circuit in the wire harness.
Standard Resistance:
(m) for 13 Speakers:
Measure the resistance between each of the rear No. 2 speakers and the rear No. 3 speakers to check for an open circuit in the wire harness.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. 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.
5. INSPECT REAR SPEAKER
(a) Resistance check
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 13 Speakers
for 8 Speakers
Text in Illustration
(b) Proceed to the next step based on the inspection result.
Result:
B -- INSPECT DCM (TELEMATICS TRANSCEIVER)
C -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal
D -- REPLACE REAR SPEAKER Removal
A -- Continue to next step.
6. 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.
7. INSPECT REAR NO. 3 SPEAKER
(a) Resistance check
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
(b) Proceed to the next step based on the inspection result.
Result:
B -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal
C -- REPLACE REAR NO. 3 SPEAKER Removal
A -- Continue to next step.
8. INSPECT DCM (TELEMATICS TRANSCEIVER)
(a) Resistance check
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE DCM (TELEMATICS TRANSCEIVER) Removal
OK -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal
9. CHECK HARNESS AND CONNECTOR
(a) Disconnect P28 stereo component amplifier assembly connector.
(b) Disconnect M12, M4, L5, L2 and P21*1 speaker connectors.
*1: for 13 Speakers
(c) Measure the resistance between the stereo component amplifier assembly and body ground to check for a short circuit in the wire harness.
Standard Resistance:
*1: for 13 Speakers
(d) Measure the resistance between each of the front No. 2 speakers and body ground to check for a short circuit in the wire harness.
Standard Resistance:
(e) Measure the resistance between each of the front No. 3 speakers and the stereo component amplifier assembly to check for an open circuit in the wire harness.
Standard Resistance:
(f) Measure the resistance between each of the front No. 2 speakers and the front No. 3 speakers to check for an open circuit in the wire harness.
Standard Resistance:
(g) for 13 Speakers:
Measure the resistance between the stereo component speaker and the stereo component amplifier assembly to check for an open circuit in the wire harness.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. 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
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
(b) Proceed to the next step based on the inspection result.
Result:
B -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal
C -- REPLACE FRONT NO. 3 SPEAKER Removal
A -- Continue to next step.
12. INSPECT 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 STEREO COMPONENT SPEAKER Removal
OK -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal