Check Wiring Harness Between the Main Unit and CD Changer

Check The Wiring Harness Between The Main Unit And The CD Changer







- Remove component Main unit Audio system

Unplug the connector:
- Main unit, Audio system (353 A,B,C)







Unplug the connector.
- CD changer (355)

















Take a resistance reading between

- 7 - Main Unit, Audio: connector C
- 3 - CD changer

The reading should be 0 Ohm - 1 Ohm

Checking the wiring harness.
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO - Rectifying the Lead - I

YES - Continue with Check The Wiring Harness Between The Main Unit And The CD Changer.

















Take a resistance reading between

- 9 - Main Unit, Audio: connector C
- 8 - CD changer

The reading should be 0 Ohm - 1 Ohm

Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks end short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO - Rectifying the Lead - II

YES - Continue with Check The Wiring Harness Between The Main Unit And The CD Changer.

















Take a resistance reading between

- 8 - Main Unit, Audio: connector C
- 2 - CD changer

The reading should be 0 Ohm - 1 Ohm

Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO - Rectifying the Lead - III

YES - Continue with Check The Wiring Harness Between The Main Unit And The CD Changer.

















Take a resistance reading between

- 10 - Main Unit, Audio: connector C
- 7 - CD changer

The reading should be 0 Ohm - 1 Ohm

Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO - Rectifying the Lead - IV

YES - Continue with Check The Wiring Harness Between The Main Unit And The CD Changer.












Measure the resistance. The value should be finite.

- 10 - Main Unit, Audio: connector C
- Good grounding point

Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the reading correct?

NO - Rectifying the Lead - IV

YES - Continue with Check The Wiring Harness Between The Main Unit And The CD Changer.












Measure the resistance. The value should be infinite.

- 9 - Main Unit, Audio: connector C
- Good grounding point

Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the reading correct?

NO - Rectifying the Lead - II

YES - Continue with Check The Wiring Harness Between The Main Unit And The CD Changer.












Measure the resistance. The value should be infinite.

- 8 - Main Unit, Audio: connector C
- Good grounding point

Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the reading correct?

NO - Rectifying the Lead - III

YES - Continue with Check The Wiring Harness Between The Main Unit And The CD Changer.












Measure the resistance. The value should be infinite.

- 10 - Main Unit, Audio: connector C
- Good grounding point

Checking the wiring harness
Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the reading correct?

NO - Rectifying the Lead - IV

YES - Before Changing A Control Module