Bench Testing the 90-96 Cluster

 

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Testing the Cluster

Wiring Diagrams and Cluster Pinout - Click Here

 

Note: If you're using our wiring harness, the red wires are all connected to +12V, and the black wires are connected to ground.

  1. Connect the wiring harness to either the power brick or the 12V cord and connect it to a power source.

  2. Connect a red wire to pin A4 of the instrument panel. Connect a black wire to pin A1 of the instrument Panel.

  3. The voltage needle should point to approximately 12V, or the center of the gauge.
    The Tachometer should point to 0 RPM.

  4. The Oil Pressure gauge should show 80PSI or more. The Oil Temp gauge should show less than 100 degrees F. The Coolant Temp should show less than 100 degrees F.

  5. Connect a black wire to pin B1. The Oil Temperature gauge should indicate greater than 320F. Disconnect the black wire from pin B1. My tests show that a sensor value of 25 Ohms gives a reading of 320F, and 50 Ohms gives a reading of 1/2 way (~210F).

  6. Connect a black wire to pin B2. The Coolant Temperature gauge should indicate greater than 260F. Disconnect the black wire from pin B2. My tests show that a sensor value of 57-61 Ohms causes a reading of 260F.

  7. Connect a black wire to pin B3. The Oil Pressure gauge should indicate 0 PSI. Disconnect the black wire from pin B3. My tests show that a sensor value of 90 Ohms causes oil pressure to read 80PSI, and a value of 45 Ohms causes a reading of 40 PSI.

  8. Connect a red wire to pin B5 and a black wire to pin B4. The two bulbs which illuminate the LCD panel should light. If not, change the bulbs. Disconnect the wires from pins B4 and B5.

  9. Connect a red wire to pin B13 and another red wire to pin B17. Connect a black wire to pin B12. The "Security" bulb should illuminate. If not, change the bulb. Disconnect the wire from pin B12.

  10. Connect a black wire to pin A6. The High Beam indicator should light. If not, change the bulb. Disconnect the wire from pin A6.

  11. Connect a black wire to pin A9. The Fasten Seat Belt light should come on. If not, change the bulb. Disconnect the wire from pin A9.

  12. Connect a black wire to pin B14. The Change Oil light should come on. If not, change the bulb. Disconnect the wire from pin B14.

  13. Connect a black wire to pin A10. The Check Gauges bulb should come on. If not, change the bulb. Disconnect the wire from pin A10.

  14. Connect a black wire to pin B16. The One to Four light should come on. If not, change the bulb. Disconnect the wire from pin B16.

  15. Connect a black wire to pin B15. The Shift indicator (90) or Door Ajar (96) should come on. If not, change the bulb. Disconnect the wire from pin B15.

  16. Connect a black wire to pin B6. The Brake indicator (Park Brake on 96) should come on. If not, change the bulb. Disconnect the wire from pin B6.

  17. Connect a black wire to pin B7. The Door Ajar (90) or Brake(!) indicator (96) should come on.
    If not, change the bulb. Disconnect the wire from pin B7.

  18. Connect a red wire to pin A3. Connect a black wire to pin A2. The 6 bulbs behind the needles should illuminate. Disconnect the wires from pins A2 and A3.

  19. Connect a black wire to pin A7. Connect a red wire to pin A5. The right turn indicator should come on. If not, change the bulb. Disconnect the wire from pin A5.

  20. Connect a red wire to pin A8. The left turn indicator should come on. If not, change the bulb. Disconnect the wires from pins A8 and A7.

  21. To test the tachometer, you'll need a signal generator (or a simple 555 timer circuit). Set it to square wave or sine wave, 1Vpk (2Vpk-pk) amplitude, no DC offset. Connect the positive terminal topin B10, and the negative terminal of the signal generator to the power supply ground. 0Hz should cause the tach needle to indicate 0RPM. 25Hz should cause the needle to go to ~500RPM. 200 Hz should cause the needle to go to 3000RPM. 400Hz should cause the needle to read 6000RPM. Do not exceed 400Hz.

If the tach spikes past 6000RPM at power on, then goes to below 0RPM,or if the tach reading is wrong by more than 500RPM, a resistor network has failed inside the cluster. We sell a replacement here.

Testing the LCD Panel

Note: If you see any intermittent operation of the LCD, the LCD board connector should be changed.

Note 2: Bench Testing the LCD Panel requires a working Central Control Module (CCM).

  1. Connect a red wire to pins E4, E5, F1, and F2. Connect a black wire to pin C1 and E15 and E16.

  2. To emulate the resistor in the key, connect a potentiometer between pins E12 and F5. Adjust it until you see the power come on.

  3. Connect pin F16 of the CCM to pin A12 of the Instrument Panel Connector.

  4. Connect pin F11 of the CCM to pin A11 of the Instrument Panel Connector.

  5. Connect pin F14 of the CCM to pin A14 of the Instrument Panel Connector.

  6. Connect pin F13 of the CCM to pin A15 of the Instrument Panel Connector.

  7. Connect pin E1 of the CCM to pin A16 of the Instrument Panel Connector.

  8. Connect pin D1 of the CCM to pin A17 of the Instrument Panel Connector.

  9. Connect pin D11 of the CCM to pin A13 of the Instrument Panel Connector.

  10. Connect pin D8 of the CCM to pin B4 of the Instrument Panel Connector.

  11. The Speedometer should be 0MPH and the fuel gauge should be full.

  12. Connect a black wire to pin E9. The fuel gauge should read 0.

  13. Connect a red wire to pins A3 and B5 of the Instrument Panel connector. Connect a wire from pin A2 of the instrument panel connector to pin E3 of the CCM. Connect another wire from pin B4 of the instrument panel to pin D8 of the CCM.

  14. Connect a 90 Ohm pot between the 12V power supply positive terminal and pin E7 of the ECM.

  15. Connect a red wire to pin D14 to simulate the headlights on. The panel bulbs behind the needles and LCD should dim.

  16. Adjust the pot to change the brightness.

  17. Connect a variable voltage to pin E10. This simulates ambient lighting sensor.

  18. Testing the speedometer:

Warning: This step will cause the odometer (stored in the CCM ROM) to increase.

You'll need a signal generator (or a simple 555 timer circuit). Set it to square wave or sine wave, 1Vpeak (2Vpk-pk) amplitude, and no DC offset. Connect the positive terminal to pin E2 and the negative terminal to the battery ground.