Pinpoint Tests
Refrigerator
Pinpoint Tests
Pinpoint Test A: The Refrigerator Inoperative/Does Not Operate Correctly
Refer to Wiring Diagrams Set 105, Refrigerated Console for schematic and connector information. Electrical Diagrams
Normal Operation
When the ignition switch is in the RUN or ACCESSORY position, voltage is supplied to the refrigerator relay coil from the Smart Junction Box (SJB). The refrigerator relay coil is grounded at all times, high current voltage is supplied to the refrigerator relay from Battery Junction Box (BJB). When the refrigerator relay is activated, voltage is supplied to the refrigerator. The refrigerator module is grounded through an external ground. When the refrigerator switch is in the on position, power and ground are supplied to the refrigerator motor/compressor. The condenser cooling fan runs continuously, as soon as a refrigerator mode is selected. The fan will not stop with the compressor if the target temperature is reached.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Refrigerator relay
- Refrigerator switch
- Refrigerator
- Wiring, terminals or connectors
PINPOINT TEST A : THE REFRIGERATOR DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
A1 CHECK CIRCUIT FOR VOLTAGE
- Disconnect: Refrigerator C4315.
- Ignition ON.
- Measure the voltage between refrigerator C3415-1, circuit CBB25 (WH/OG), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to A6.
No
GO to A2.
A2 CHECK THE REFRIGERATOR RELAY
- Ignition OFF.
- Disconnect: Refrigerator Relay.
- Carry out the Relay component test for the BJB (Battery Junction Box) refrigerator relay.
Did the refrigerator relay pass the component test?
Yes
GO to A3.
No
INSTALL a new refrigerator relay. TEST the system for normal operation.
A3 CHECK CIRCUIT FOR VOLTAGE
- Ignition ON.
- Measure the voltage between BJB (Battery Junction Box) refrigerator relay pin 2, circuit CBP34 (VT/BN), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to A4.
No
VERIFY SJB (Smart Junction Box) fuse 34 (5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. REPAIR the circuit. TEST the system for normal operation. Electrical Diagrams
A4 CHECK CIRCUIT FOR VOLTAGE
- Measure the voltage between BJB (Battery Junction Box) refrigerator relay pin 5, circuit SBB25 (RD), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to A5.
No
VERIFY BJB (Battery Junction Box) fuse 25 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. REPAIR the circuit. TEST the system for normal operation. Electrical Diagrams
A5 CHECK RELAY CIRCUIT GROUND FOR AN OPEN
- Measure the resistance between BJB (Battery Junction Box) refrigerator relay pin 1, circuit GD120 (BK/GN) and ground.
Is the resistance less than 5 ohms?
Yes
GO to A6.
No
REPAIR the open circuit. TEST the system for normal operation.
A6 CHECK REFRIGERATOR MODULE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between refrigerator C3415-3, circuit GD149 (BK/GY), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to A7.
No
REPAIR the circuit(s). TEST the system for normal operation.
A7 CHECK THE REFRIGERATOR SWITCH
- Remove the refrigerator switch. Refer to Refrigerator Switch .
- Carry out the Refrigerator Switch component test.
Did the refrigerator switch pass the component test?
Yes
GO to A8.
No
INSTALL a new refrigerator switch.
A8 CHECK COMPRESSOR POWER CIRCUIT FOR VOLTAGE
- Disconnect: Compressor.
- Ignition ON.
- Measure the voltage between refrigerator compressor power circuit red wire, harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to A9.
No
REPAIR open circuit, if circuit OK, GO to A10.
A9 CHECK COMPRESSOR GROUND CIRCUIT
- Disconnect: Compressor.
- Ignition ON.
- Measure the resistance between refrigerator ground circuit, black wire, harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to A11.
No
REPAIR the circuit. TEST the system for normal operation.
A10 CHECK FOR CORRECT REFRIGERATOR MODULE OPERATION
- Disconnect all refrigerator connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all the refrigerator 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 refrigerator module. REFER to Refrigerator .
No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
A11 CHECK FOR CORRECT REFRIGERATOR COMPRESSOR OPERATION
- Disconnect all refrigerator compressor connectors.
- Check for:
- corrosion.
- pushed-out pins.
- Connect all the refrigerator compressor 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 refrigerator compressor. REFER to Refrigerator .
No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. TEST the system for normal operation.