GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Opel 🢒 2009 🢒 Insignia HB (Global Epsilon) 🢒 Engine 🢒 Engine Cooling 🢒 DTC P1484

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P1484 00: Cooling Fan System Performance

Diagnostic Fault Information

Cooling Fan Left High Speed Relay

Circuit

Short to Ground

High Resistance

Open

Short to voltage

Signal Performance

Relay Coil Ignition Circuit

P0691 00

P0691 00

P0480 00

--

--

Relay Switch B+ Circuit

1

1

1

--

--

Relay Coil Control Circuit

P0691 00

P0691 00

P0480 00

P0692 00

P1484 00

Relay Controlled Output Circuit

1

1

1

2

--

  1. Low and medium speed fan inoperative without a DTC.
  2. Medium speed fan always ON without a DTC.

Cooling Fan Left Low Speed Relay, Cooling Fan Speed Control Relay and Cooling Fan Right Low Speed Relay

Circuit

Short to Ground

High Resistance

Open

Short to voltage

Signal Performance

Relay Coil Ignition Circuit

P0693 00

P0693 00

P0481 00

--

--

Relay Switch B+ Circuit

1

1

1

--

--

Relay Coil Control Circuit

P0693 00

P0693 00

P0481 00

P0694 00

P1484 00

Relay Controlled Output Circuit

1

1

1

2

--

  1. Fans inoperative without a DTC.
  2. Medium speed fan always ON without a DTC.

Cooling Fan Medium Speed Relay

Circuit

Short to Ground

High Resistance

Open

Short to voltage

Signal Performance

Relay Coil Ignition Circuit

P0695 00

P0695 00

P0482 00

--

--

Relay Switch B+ Circuit

1

1

1

--

--

Relay Coil Control Circuit

P0695 00

P0695 00

P0482 00

P0696 00

P1484 00

Relay Controlled Output Circuit

1

1

1

2

--

  1. High speed fan inoperative without a DTC.
  2. High speed fan always ON without a DTC.

Circuit/System Description

The engine control module (ECM) commands the fan ON in either high speed, medium speed, or low speed, depending on cooling requirements. In low speed, the fan are turned ON at a reduced speed. In medium speed, the fans are turned ON at a higher reduced speed. In high speed, the fans are turned ON at full speed. In low speed operation, the ECM provides ground to ECM terminal 94 (X2). The cooling fan relay activates and provides ground to the coil of the cooling fan left high speed relay. The cooling fan speed control relay remains inactive because ECM terminal 90 (X2) is not grounded. The cooling fan left high speed relay provides power to the engine cooling fan-right through engine cooling fan-left and the internal fan resistor of engine cooling fan-right.

In medium speed operation, the ECM provides ground to ECM terminal 90 (X2). The cooling fan left low speed, cooling fan speed control relay and the cooling fan right low speed relay are activated. The internal fan resistor of the engine cooling fan-left is provided with power through the cooling fan left low speed relay. The cooling fan speed control relay is active an d therefore the engine cooling fan-left terminal 3 is directly shorted to ground. The cooling fan right low speed relay is active and provides power to the internal resistor of the engine cooling fan-right. The engine cooling fan-right terminal 3 is directly shorted to ground. Both fans runs with medium speed.

In high speed operation, the ECM provides ground to ECM terminals 90 (X2), 91 (X2) and 94 (X2). Cooling fan left high speed relay, cooling fan medium speed 1 relay, cooling fan left low speed relay, cooling fan speed control relay and cooling fan right low speed relay are activated. Power is now provided to both cooling fan terminals 1. The engine cooling fan relay-left is directly shorted to ground through the cooling fan speed control relay. The engine cooling fan-right is directly shorted to ground. In this constellation both fans run without resistor.

Conditions for Running the DTC
    • The ignition voltage is between 8-18 V.
    • The engine is running greater than or equal to 400 RPM.

Conditions for Setting the DTC

The ECM detects an over current at the output powerstage.

Action Taken When the DTC Sets

DTC P1484 00 is a Type A DTC.

Conditions for Clearing the DTC

DTC P1484 00 is a Type A DTC.

Reference Information

Schematic Reference

Engine Cooling Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cooling Fan Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification
  1. Command the Cooling Fan Relay 1 ON and OFF with a scan tool. The clicking sound of the relay should be heard when changing between the commanded states.
    2. ⇒If the relay does not operate correctly, refer to Cooling Fan Left High Speed Output Malfunction.
  2. Command the Cooling Fan Relay 2 ON and OFF with a scan tool. The clicking sound of the relay should be heard when changing between the commanded states.
    3. ⇒If the relay does not operate correctly, refer to Cooling Fan Left Low Speed Output Malfunction.
  3. Command the Cooling Fan Relay 3 ON and OFF with a scan tool. The clicking sound of the relay should be heard when changing between the commanded states.
    4. ⇒If the relay does not operate correctly, refer to Cooling Fan Medium Speed Output Malfunction.

Circuit/System Testing

Cooling Fan Left High Speed Output Malfunction

  1. Ignition OFF, disconnect the KR20J Cooling Fan Left High Speed Relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the relay coil control circuit terminal and ground.
    3. ⇒If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM).
  3. Ignition OFF, disconnect the K20 Engine Control Module (ECM). Test for an infinite resistance between the relay coil control circuit terminal and ground.
    4. ⇒If less than the specified value, test the relay coil control circuit for a short to ground.
  4. Test for less than 5.0 Ω between relay coil control circuit terminal and K20 Engine Control Module (ECM) terminal 94 (X2).
    5. ⇒If greater than the specified value, test the relay coil control circuit for an open/high resistance.
  5. Test for 70-110 Ω between terminals 85 and 86 of the KR20J Cooling Fan Left High Speed Relay.
    6. ⇒If the resistance is not within the specified range, replace the KR20J Cooling Fan Left High Speed Relay.

Cooling Fan Left Low Speed Output Malfunction

  1. Ignition OFF, disconnect the KR20G Cooling Fan Left Low Speed Relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the relay coil control circuit terminal and ground.
    3. ⇒If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM).
  3. Ignition OFF, disconnect the K20 Engine Control Module (ECM). Test for an infinite resistance between the relay coil control circuit terminal and ground.
    4. ⇒If less than the specified value, test the relay coil control circuit for a short to ground.
  4. Test for less than 5.0 Ω between relay coil control circuit terminal and K20 Engine Control Module (ECM) terminal 94 (X2).
    5. ⇒If greater than the specified value, test the relay coil control circuit for an open/high resistance.
  5. Test for 70-110 Ω between terminals 85 and 86 of the KR20G Cooling Fan Left Low Speed Relay.
    6. ⇒If the resistance is not within the specified range, replace the KR20G Cooling Fan Left Low Speed Relay.

Cooling Fan Medium Speed Output Malfunction

  1. Ignition OFF, disconnect the KR20A Cooling Fan Medium Speed Relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the relay coil control circuit terminal and ground.
    3. ⇒If the test lamp illuminates, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM).
  3. Ignition OFF, disconnect the K20 Engine Control Module (ECM). Test for an infinite resistance between the relay coil control circuit terminal and ground.
    4. ⇒If less than the specified value, test the relay coil control circuit for a short to ground.
  4. Test for less than 5.0 Ω between relay coil control circuit terminal and K20 Engine Control Module (ECM) terminal 94 (X2).
    5. ⇒If greater than the specified value, test the relay coil control circuit for an open/high resistance.
  5. Test for 70-110 Ω between terminals 85 and 86 of the KR20A Cooling Fan Medium Speed Relay.
    6. ⇒If the resistance is not within the specified range, replace the KR20A Cooling Fan Medium Speed Relay.

Component Testing

Dynamic Test

  1. Ignition OFF, disconnect the applicable relay.
  2. Test for 70-110 Ω between terminals 85 and 86 of the relay.
    3. ⇒If the resistance is not within the specified range, replace the relay.
  3. Test for infinite resistance between the following terminals:
    4. • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    • 30 and 86
         ⇒If not the specified value, replace the relay.
  4. Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 Ω between terminals 30 and 87.
    5. ⇒If more than the specified value, replace the relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement
    •  Control Module References for ECM replacement, setup, and programming

Repair Verification
  1. Ignition ON, verify with a scan tool that the ECM is not commanding fan activation.
  2. Ignition ON, observe that the fan is not activated.

Ignition ON, verify with a scan tool that the ECM is not commanding fan activation. Ignition ON, observe that the fan is not activated.