Check the Wiring Harness Between the Main Unit and Telephone

Check The Wiring Harness Between The Main Unit And The Mobile Telephone Connection







- Remove component: Main unit, Audio system

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







Unplug the connector:
- Mobile telephone connection (375)

















Take a resistance reading between
- 3 - Main unit: Connector A
- 5 - Mobile telephone connection

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 Mobile Telephone Connection

















Take a resistance reading between
- 3 - Main unit, Audio: Connector C
- 7 - Mobile telephone connection

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 - II

YES - Continue With Check The Wiring Harness Between The Main Unit And The Mobile Telephone Connection

















Take a resistance reading between
- 1 - Main unit, Audio: Connector C
- 8 - Mobile telephone connection

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 Mobile Telephone Connection












Measure the resistance. The value should be infinite.
- 3 - Main unit, Audio: Connector A
- - 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 - I

YES - Continue With Check The Wiring Harness Between The Main Unit And The Mobile Telephone Connection












Measure the resistance. The value should be infinite.
- 3 - 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 Mobile Telephone Connection












Measure the resistance. The value should be infinite.

- 1 - 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 - Checking the Handsfree Unit