Pinpoint Test A: An UPFITTER Switch Relay Controlled Component Is Inoperative
WARNING: This page is about a different car, the 2022 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
- REFER to: Customer Access
for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Auxiliary Switches .
Possible Sources
- Wiring, terminals or connectors
- Midi fuse F5 (100A)
- Upfitter relay box fuses
- Upfitter switch
- Upfitter relay box
Visual Inspection and Pre-checks
- REMOVE and INSPECT F1 (25A), F2 (20A), F3 (25A), F5 (15A), F11A (10A), F11B (5A), F12A (5A) and F12B (5A)
NOTE: For accurate diagnostics of customer (upfitter) installed devices, it will be necessary to refer to the upfitter literature for additional information.NOTE: To install the upfitter switches on a vehicle that was not originally equipped from the factory and additional information, refer to the Owner's Literature and www.fleet.ford.com for truck body builder advisory service bulletins. - A1 CHECK THE UPFITTER SWITCHES
- Ignition ON.
- Operate all the upfitter switches.
Are all the upfitter switches inoperative?
Yes GO to Pinpoint Test B No GO to A2 - A2 CHECK THE UPFITTER RELAY
- Ignition OFF.
- Substitute the suspect relay with a known good relay.
- Ignition ON.
- Place the upfitter switch in question to the on position.
Does the accessory operate?
Yes INSTALL a new relay. No REMOVE the known good relay. GO to A3 - A3 CHECK THE UPFITTER RELAY COIL POWER CIRCUITS
- Ignition OFF.
- Disconnect C146 .
- Place the upfitter switch in question to the ON position.
- Ignition ON.
- Measure:
Upfitter relay 1
Positive Lead Measurement / Action Negative Lead C146-1 Ground Upfitter relay 2
Positive Lead Measurement / Action Negative Lead C146-2 Ground Upfitter relay 3
Positive Lead Measurement / Action Negative Lead C146-9 Ground Upfitter relay 4
Positive Lead Measurement / Action Negative Lead C146-8 Ground Upfitter relay 5
Positive Lead Measurement / Action Negative Lead C146-3 Ground Upfitter relay 6
Positive Lead Measurement / Action Negative Lead C146-7 Ground
Is the voltage greater than 11 volts?
Yes GO to A6 No GO to A4 - A4 CHECK THE UPFITTER RELAY COIL POWER CIRCUITS FOR AN OPEN
- Disconnect Upfitter Switch C9120 .
- Measure:
Upfitter relay 1
Positive Lead Measurement / Action Negative Lead C9120-4 C146-1 Upfitter relay 2
Positive Lead Measurement / Action Negative Lead C9120-6 C146-2 Upfitter relay 3
Positive Lead Measurement / Action Negative Lead C9120-10 C146-9 Upfitter relay 4
Positive Lead Measurement / Action Negative Lead C9120-9 C146-8 Upfitter relay 5
Positive Lead Measurement / Action Negative Lead C9120-8 C146-3 Upfitter relay 6
Positive Lead Measurement / Action Negative Lead C9120-7 C146-7
Is the resistance less than 1 ohm?
Yes GO to A5 No REPAIR the circuit in question. - A5 CHECK THE UPFITTER RELAY COIL POWER CIRCUITS FOR A SHORT TO GROUND
- Measure:
Upfitter relay 1
Positive Lead Measurement / Action Negative Lead C9120-4 Ground Upfitter relay 2
Positive Lead Measurement / Action Negative Lead C9120-6 Ground Upfitter relay 3
Positive Lead Measurement / Action Negative Lead C9120-10 Ground Upfitter relay 4
Positive Lead Measurement / Action Negative Lead C9120-9 Ground Upfitter relay 5
Positive Lead Measurement / Action Negative Lead C9120-8 Ground Upfitter relay 6
Positive Lead Measurement / Action Negative Lead C9120-7 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to A7 No REPAIR the circuit in question. - Measure:
- A6 CHECK THE UPFITTER RELAY COIL GROUND CIRCUITS
- Ignition OFF.
- Measure:
Positive Lead Measurement / Action Negative Lead C146-6 Ground C146-4 Ground C146-11 Ground C146-5 Ground C146-10 Ground C146-12 Ground
Is the resistance less than 3 ohms on each circuit?
Yes GO to A7 No REPAIR the faulty circuit for an open. If no open is found, INSTALL a new upfitter relay box. - A7 CHECK THE UPFITTER RELAY SWITCHED POWER CIRCUIT
- Ignition OFF.
- Disconnect Upfitter Relay Box C3271A .
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C3271A-1 Ground
Is the voltage greater than 11 volts?
Yes GO to A9 No REMOVE and INSPECT Midi fuse F5 (100A). If fuse is open, REPAIR the circuit for a short to ground. If the fuse is good, GO to A8 - A8 CHECK THE UPFITTER RELAY SWITCHED POWER CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect High Current BJB C1617E .
Is the resistance less than 1 ohm?
Yes If all customer access outputs were not functioning, INSTALL a new upfitter relay box. If some but not all were functioning, GO to A9 No REPAIR the circuit. - A9 CHECK FOR VOLTAGE AT UPFITTER RELAY BOX FUSES
- REMOVE and INSPECT each relay fuse for an open.
- If the fuse is open, REFER to: Customer Access the customer access wiring schematics to locate the faulty circuit.
- Ignition ON.
- If the fuse is good, measure:
Upfitter relay box
Positive Lead Measurement / Action Negative Lead Upfitter Relay Box Fuse 1 (25A) Ground Upfitter Relay Box Fuse 2 (20A) Ground Upfitter Relay 1 Fuse 3 (25A) Ground Upfitter Relay 2 Fuse 5 (15A) Ground Upfitter Relay 3 Fuse 11A (10A) Ground Upfitter Relay 4 Fuse 11B (5A) Ground Upfitter Relay 5 Fuse 12A (5A) Ground Upfitter Relay 6 Fuse 12B (5A) Ground
Is the voltage greater than 11 volts?
Yes GO to A10 No INSTALL a new upfitter relay box. - A10 BYPASS THE UPFITTER RELAY
- Ignition OFF.
- Remove the upfitter relay controlled circuit in question, connect a fused jumper wire
- Ignition ON.
Did the accessory operate?
Yes The system is operating correctly. The fault may have been a loose connector, fuse or relay. No GO to A11 - A11 CHECK THE UPFITTER RELAY SUPPLY VOLTAGE
- For the relay circuit in question, measure:
Positive Lead Measurement / Action Negative Lead Upfitter Relay Pin 3 Ground
Is the voltage greater than 11 volts?
Yes INSTALL a new upfitter relay box. No REFER to: Customer Access the customer access wiring schematics to locate the faulty circuit. - For the relay circuit in question, measure: