Pinpoint Tests

Clock

Pinpoint Tests

Pinpoint Tests A: The Clock Is Inoperative

Refer to Wiring Diagram Set 44, Horn/Cigar Lighter for schematic and connector information. Diagrams By Number

Normal Operation

The clock receives battery voltage from the Smart Junction Box (SJB).

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- Clock
- SJB

PINPOINT TEST A: THE CLOCK IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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A1 CHECK FOR VOLTAGE TO THE CLOCK


- Ignition OFF.
- Disconnect: Clock C2016.
- Measure the voltage between the clock C2016-6, circuit SBP14 (BN/RD), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to A2.

No
VERIFY the SJB fuse 14 (10A) is OK. If OK, GO to A3. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number

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A2 CHECK FOR VOLTAGE TO THE CLOCK USING THE CONNECTOR


- Measure the voltage between the clock C2016-6, circuit SBP14 (BN/RD), harness side and the clock C2016-5, circuit GD150 (BK/WH), harness side.




- Is the voltage greater than 10 volts?

Yes
INSTALL a new clock. REFER to Clock Service and Repair. TEST the system for normal operation.

No
REPAIR circuit GD150 (BK/WH) for an open. TEST the system for normal operation.

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A3 CHECK THE CLOCK VOLTAGE CIRCUIT FOR AN OPEN


- Disconnect: SJB C2280b.
- Measure the resistance between the SJB C2280b-4, circuit SBP14 (BN/RD), harness side and the clock C2016-6, circuit SBP14 (BN/RD), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to A4.

No
REPAIR circuit SBP14 (BN/RD) for an open. TEST the system for normal operation.

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A4 CHECK FOR CORRECT SJB OPERATION


- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new SJB. REFER to Multifunction Electronic Modules Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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