Navigation Multi Info Display. Navigation System Speaker Circuit

Audio Visual Telematics. Corolla. Zre142 Aze141

Navigation Multi Info Display. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR

INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

INSPECT REAR SPEAKER ASSEMBLY

NAVIGATION SYSTEM - Speaker Circuit

DESCRIPTION

If there is a short in a speaker circuit, the radio and display 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 and display receiver assembly or speakers.

WIRING DIAGRAM

Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System Speaker Circuit

INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR

Disconnect the connectors from the radio and display receiver assembly and speakers.

Measure the resistance between each of the front No. 2 speaker assemblies and the radio and display receiver assembly to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
E126-1 (FR+) - H4-4 (+)	Always	Below 1 Ω
E126-5 (FR-) - H4-2 (-)	Always	Below 1 Ω
E126-2 (FL+) - I4-4 (+)	Always	Below 1 Ω
E126-6 (FL-) - I4-2 (-)	Always	Below 1 Ω

Measure the resistance between each of the front No. 1 speaker assemblies and the front No. 2 speaker assemblies to check for an open circuit in the wire harness.
Standard Resistance:
Tester Connection
Condition
Specified Condition
H4-3 (TWR+) - H1-1
Always
Below 1 Ω
H4-1 (TWR-) - H1-2
Always
Below 1 Ω
I4-3 (TWL+) - I1-1
Always
Below 1 Ω
I4-1 (TWL-) - I1-2
Always
Below 1 Ω

Measure the resistance between each of the rear speaker assemblies and the radio and display receiver assembly to check for an open circuit in the wire harness.
Standard Resistance:
Tester Connection
Condition
Specified Condition
E127-1 (RR+) - L1-1
Always
Below 1 Ω
E127-3 (RR-) - L1-2
Always
Below 1 Ω
E127-2 (RL+) - L2-1
Always
Below 1 Ω
E127-6 (RL-) - L2-2
Always
Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
E126-1 (FR+) - Body ground	Always	10 kΩ or higher
E126-5 (FR-) - Body ground	Always	10 kΩ or higher
E126-2 (FL+) - Body ground	Always	10 kΩ or higher
E126-6 (FL-) - Body ground	Always	10 kΩ or higher
E127-1 (RR+) - Body ground	Always	10 kΩ or higher
E127-3 (RR-) - Body ground	Always	10 kΩ or higher
E127-2 (RL+) - Body ground	Always	10 kΩ or higher
E127-6 (RL-) - Body ground	Always	10 kΩ or higher

Measure the resistance between each of the front No. 2 speaker assemblies and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H4-3 (TWR+) - Body ground	Always	10 kΩ or higher
H4-1 (TWR-) - Body ground	Always	10 kΩ or higher
I4-3 (TWL+) - Body ground	Always	10 kΩ or higher
I4-1 (TWL-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

Resistance check
1. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  H1-1 - H1-2
  Always
  3.2 to 4.8 Ω
  I1-1 - I1-2
  Always
  3.2 to 4.8 Ω
  Text in Illustration
  *A
  for RH
  *B
  for LH
  *a
  Component without harness connected
  (Front No. 1 Speaker Assembly)

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY (COROLLA_ZRE142 RM000002XAP016X.html)

OK

3.INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

Resistance check

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
H4-2 (-) - H4-4 (+)	Always	10 kΩ or higher
H4-1 (TWR-) - H4-2 (-)	Always	Below 1 Ω
H4-3 (TWR+) - H4-4 (+)	Always	Below 1 Ω
I4-2 (-) - I4-4 (+)	Always	10 kΩ or higher
I4-1 (TWL-) - I4-2 (-)	Always	Below 1 Ω
I4-3 (TWL+) - I4-4 (+)	Always	Below 1 Ω

Text in Illustration
*A	for RH
*B	for LH
*a	Component without harness connected (Front No. 2 Speaker Assembly)

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY (COROLLA_ZRE142 RM000002XAP016X.html)

OK

4.REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

Check that the malfunction disappears when a known good speaker is installed (COROLLA_ZRE142 RM000002XAP016X.html).
OK:
Malfunction disappears.
HINT:
1. Connect all the connectors to the front No. 2 speaker assemblies that were disconnected.
2. 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.
3. Perform the above inspection on both LH and RH sides.

Go to step 5

END (FRONT NO. 2 SPEAKER ASSEMBLY WAS DEFECTIVE)

5.INSPECT REAR SPEAKER ASSEMBLY

Resistance check
1. Measure the resistance according to the value(s) in the table below.
  Standard Resistance:
  Tester Connection
  Condition
  Specified Condition
  L1-1 - L1-2
  Always
  3.2 to 4.8 Ω
  L2-1 - L2-2
  Always
  3.2 to 4.8 Ω
  Text in Illustration
  *A
  for RH
  *B
  for LH
  *a
  Component without harness connected
  (Rear Speaker Assembly)

REPLACE REAR SPEAKER ASSEMBLY (COROLLA_ZRE142 RM000002XAY01CX.html)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM0000011BR0H9X.html)

*A	for RH
*B	for LH
*a	Component without harness connected (Rear Speaker Assembly)

Tester Connection	Condition	Specified Condition
H1-1 - H1-2	Always	3.2 to 4.8 Ω
I1-1 - I1-2	Always	3.2 to 4.8 Ω

Tester Connection	Condition	Specified Condition
L1-1 - L1-2	Always	3.2 to 4.8 Ω
L2-1 - L2-2	Always	3.2 to 4.8 Ω