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Illustration
of the BASE cluster
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Illustration
of the GAUGES (UB3) cluster
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Base Cluster to Gauges Cluster
Applies to:
It is possible to replace the BASE digital instrument cluster with the much nicer GAUGES instrument cluster (option UB3). However, it is not simply plug & play. Although the connectors are physically the same, all but one wire are in different positions in the connector!!! So whatever you do, do not attempt to plug in a GAUGES cluster into a car that had a BASE cluster without first rewiring the connector.
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Illustration
of the BASE cluster
|
Illustration
of the GAUGES (UB3) cluster
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The physical connector has 32-positions. 8 of which are not used (possibly more if your car has an automatic transmission or lacks anti-lock brakes). There are two rows, C1 thru C16, and D1 thru D16. To replace the BASE cluster with the GAUGES cluster, you will need to move the appropriate wires to the appropriate positions. NO wire cutting or splicing is required!!! You can move the wires around by popping them out of the plastic connector housing. There is usually a plastic terminal lock on the back of the connector. All you need to do is remove the lock by depressing the appropriate tabs or snaps. Then you should be able to use a small flathead jeweler's screwdriver to release the terminals themselves. You can then snap the wire terminals into the correct position. There is a brief illustration of this procedure in the Service Manual on page 8A-5-8. Before removing the wires from the connector housing, you will want to make note of which YELLOW wire came out of which position, because there are two yellow wires.
Here is a table of which position each wire needs to go to:
| Move Wire In | To |
|---|---|
| C1 (TAN/WHT 33) | C4 |
| C2 | |
| C3 (GRY 8) | C11 |
| C4 (PPL 30) | D13 |
| C5 (DK GRN 389) | D15 |
| C6 (YEL 726) | C10 |
| C7 (BRN/WHT 230) | D10 |
| C8 | D16 |
| C9 | D9 |
| C10 (BLK/WHT 151) | C14 |
| C11 | |
| C12 (PNK/BLK 39) | C1 |
| C13 (PNK/BLK 750) | C16 |
| C14 | |
| C15 (PNK/BLK 39) | NOT USED (leave unconnected) |
| C16 (DK GRN/WHT 35) | D12 |
| D1 | |
| D2 | |
| D3 (TAN/BLK 456) | C6 |
| D4 (LT BLU 14) | C2 |
| D5 (LT GRN 11) | C7 |
| D6 (DK BLU 15) | C3 |
| D7 (BLK 150) | D1 |
| D8 (YEL 237) | D2 |
| D9 | |
| D10 | |
| D11 (TAN 31) | D11 (same) |
| D12 | |
| D13 (GRY/WHT 852) | C5 |
| D14 (YEL/BLK 68) | D3 |
| D15 (BRN 25) | D4 |
| D16 (BRN/WHT 419) | D5 |
Once you have finished moving the wire terminals to their new positions, you still aren't finished! Although you can now safely plug in the GAUGES cluster and it will work, the OIL PRESSURE and COOLANT TEMP gauges will NOT work correctly! This is because cars with the BASE cluster simply have an OIL PRESSURE SWITCH and a COOLANT TEMP SWITCH. These switches simply activate warning lights on the BASE cluster. To get an accurate reading on the OIL PRESSURE and COOLANT TEMP gauges, you will have to replace the switches with senders. Senders can provide the variable resistance signal that the GAUGES cluster requires. The switches are located underhood and I believe the senders can directly replace the switches. Once you have done that, I believe you are all set.
Reference Material
Below are the pin assignments in text form for the BASE and GAUGES cluster so you can compare them yourself. The terminals in red denote the wires that are in different positions between the BASE and GAUGES clusters.
BASE Cluster - Pin assignments
Terminals C1-C16
| Terminal-Wire Color | Function |
|---|---|
| C1 (TAN/WHT 33) | To BRAKE Indicator. Indicator is grounded when Park Brake is on or Brake Fluid is low. Infinite ohms with Park Brake off. See Section 8A-41. |
| C2 | NOT USED |
| C3 (GRY 8) | Illumination Bulbs Dimmer Input. Variable voltage with lights ON and dimmer adjusted. See Section 8A-117. |
| C4 (PPL 30) | Fuel Gauge Sender Input. 0
ohms at E (Empty), 90 ohms at F (Full). Do Tests B, C, and D. |
| C5 (DK GRN 389) | Vehicle Speed Input from ECM. See Section 8A-33. |
| C6 (YEL 726) | VF Dim Enable Input. Battery
voltage when Park Lights or Headlights are On. See Section 8A-12. |
| C7 (BRN/WHT 230) | VF Dimmer Input. Variable voltage
with Lights ON and dimmer adjusted. See Section 8A-117. |
| C8 | Battery Input. Battery voltage
at all times. See Section 8A-11. |
| C9 | English/metric switch output to Driver Information System and Heater and A/C Control Assembly. Do Test 1 |
| C10 (BLK/WHT 151) | Ground to G101. See Section 8A-14 |
| C11 | NOT USED |
| C12 (PNK/BLK 39) | Ignition Power to Indicator.
Battery voltage in RUN, BULB TEST and START. See Section 8A-11 |
| C13 (PNK/BLK 750) | Battery Power to VF Displays.
Battery Voltage in RUN. See Section 8A-11 |
| C14 | NOT USED |
| C15 (PNK/BLK 39) | Ignition Power to the Indicators.
Battery Voltage in RUN, BULB TEST or START. See Section 8A-11 |
| C16 (DK GRN/WHT 35) | To Coolant TEMP Indicator.
Grounded with engine overheated or with Ignition Switch in BULB TEST. Normally
open. Do Tests G, H, and I. |
Terminals D1-D16
| Terminal-Wire Color | Function |
|---|---|
| D1 | NOT USED |
| D2 | NOT USED |
| D3 (TAN/BLK 456) | To SHIFT Indicator. ECM provides
a ground for the Indicator. See Section 8A-20, 21, 22, or 23 and Section 6E |
| D4 (LT BLU 14) | To Left Turn Indicator. Flashing
battery voltage with Left Turn Signal. See Section 8A-110 |
| D5 (LT GRN 11) | To Hi Beam Indicator. Battery
voltage with Hi Beams ON. See Section 100 |
| D6 (DK BLU 15) | To Right Turn Indicator. Flashing
battery voltage with Right Turn Signal. See Section 8A-110 |
| D7 (BLK 150) | Ground. See Section 8A-14. |
| D8 (YEL 237) | FASTEN BELTS Indicator. Battery voltage for about 5 seconds after Ignition is switched to RUN. See Section 8A-76 |
| D9 | NOT USED |
| D10 | NOT USED |
| D11 (TAN 31) | To OIL Pressure Indicator. Oil Pressure Switch grounds the Indicator with low oil pressure. Do Tests E and F. |
| D12 | NOT USED |
| D13 (GRY/WHT 852) | To ANTI-LOCK Indicator. See Anti-Lock Brake System (ABS) Section 8A-44 |
| D14 (YEL/BLK 68) | To LOW COOLANT Indicator. ECM
provides ground when the coolant level is low. See Section 8A-22 or 23 and Section 6E |
| D15 (BRN 25) | To CHARGE Indicator. See Section 8A-30 |
| D16 (BRN/WHT 419) | To SERVICE ENGINE SOON Indicator.
ECM provides a ground for the Indicator. See Section 6E |
GAUGES Cluster (UB3)
Terminals C1-C16
| Terminal-Wire Color | Function |
|---|---|
| C1 (PNK/BLK 39) | Ignition power to Cluster. Battery voltage in RUN, BULB TEST or START. See schematic 8A-11. |
| C2 (LT BLU 14) | To Left Turn Indicator. Flashing battery voltage with Left turn signal. 0 volts with signal off. See Schematic Section 8A-110. |
| C3 (DK BLU 15) | To Right Turn Indicator. Flashing battery voltage with Right turn signal. 0 volts with signal off. See Schematic Section 8A-110. |
| C4 (TAN/WHT 33) | To BRAKE Indicator. Indicator is grounded when Park Brake is on or Brake Fluid Level is low. Infinite ohms with Park Brake off and system OK. See Schematic Section 8A-41. |
| C5 (GRY/WHT 852) | To ANTI-LOCK Brake Indicator. See Section 8A-44. |
| C6 (TAN/BLK 456) | To Shift Indicator. ECM provides a ground when car is to be shifted. See Section 6E of the Service Manual. |
| C7 (LT GRN 11) | Hi Beam Indicator. Battery
voltage when Hi Beams are on. 0 volts with Hi Beams off. See Schematic Section 8A-100. |
| C8 | NOT USED |
| C9 | NOT USED |
| C10 (YEL 726) | Display Dim Enable. Battery voltage when Park Lights are on. 0 volts with Park Lights off. See Schematic Section 8A-114. |
| C11 (GRY 8) | To Cluster Illumination bulbs. Variable voltage with Head or Park lights on and Dimmer Control adjusted. |
| C12 | NOT USED |
| C13 (ORN 461) | Bi-directional Serial Data Link between Cluster & ECM. |
| C14 (BLK/WHT 151) | Ground to G101. See 8A-14. |
| C15 | NOT USED |
| C16 (PNK/BLK 750) | Ignition power to Cluster. Battery voltage in RUN. See 8A-11. |
Terminals D1-D16
| Terminal-Wire Color | Function |
|---|---|
| D1 (BLK 150) | Ground. See Section 8A-14. |
| D2 (YEL 237) | Safety Belt input from Component Center. Battery voltage for 5 to 10 seconds after Ignition is put in RUN. |
| D3 (YEL/BLK 68) | LOW COOLANT Indicator input. See Test L, M |
| D4 (BRN 25) | CHARGE Indicator input. See Schematic Section 8A-30. |
| D5 (BRN/WHT 419) | SERVICE ENG. SOON input from ECM. See Section 6E of Service Manual. |
| D6 | NOT USED |
| D7 | NOT USED |
| D8 | NOT USED |
| D9 (LT BLU 811) | English/metric switch output. See test N. |
| D10 (BRN/WHT 230) | VF Dimmer input. Variable voltage with lights on and dimmer adjusted. See 8A-114. |
| D11 (TAN 31) | Oil Pressure input. Sender resistance varies from 15 ohms, low pressure, to 91 ohms, high pressure. Tests E, F, G. |
| D12 (DK GRN/WHT 35) | Coolant Temperature input. Send resistance varies from 60 ohms, hot, to 1500 ohms, cold. Tests H, I, J. |
| D13 (PPL 30) | Fuel Level input. Sensor resistance varies from 18 ohms, empty, to 88 ohms, full. Tests B, C, D. |
| D14 | NOT USED |
| D15 (DK GRN 389) | Vehicle Speed input from ECM. See Schematic Section 8A-33. |
| D16 (ORN 640) | Battery power (memory) to Cluster. Battery voltage at all times. See Section 8A-11. |
