Instrument Cluster Circuit
Disconnect instrument cluster harness connectors "A", "B", "C" and "D". See Fig 1. Using DVOM, test each circuit from harness side of appropriate connector under condition as specified. See INSTRUMENT CLUSTER CIRCUIT VALUES table. If values are not as specified, repair circuits as necessary. See WIRING DIAGRAMS .
INSTRUMENT CLUSTER CIRCUIT VALUES
| Circuit Application | Tester Connection | Condition | Circuit Value |
|---|---|---|---|
| GAUGE Fuse | D2 & Ground | Ignition Switch In ON Position | Battery Voltage |
| GAUGE Fuse | D2 & Ground | Ignition Switch In LOCK, ACC Or START Position | Zero Volts |
| Light Control Rheostat | D3 & Ground | Headlights On & Rheostat In Any Position Except Fully Clockwise | 5 Volts Or Greater |
| Light Control Rheostat | D3 & Ground | Headlights On & Rheostat In Fully Clockwise Position | Zero Volts |
| Igniter | D9 & Ground | Engine Running | Voltage Varies |
| Ground | D10 & Ground | Constant | Continuity |
| DOME Fuse | D11 & Ground | Constant | Battery Voltage |
| Starter Relay | D12 & Ground | Ignition Switch In START Position | Battery Voltage |
| Starter Relay | D12 & Ground | Ignition Switch In LOCK, ACC Or ON Position | Zero Volts |
| Speed Sensor | D13 & D14 | Ignition On & Drive Shaft Turning | Less Than One Volt To 4.5-5.5 Volts |
| Speed Sensor | D13 & D14 | Ignition On & Drive Shaft Stationary | Zero Volts |
| Odometer & Twin Trip Switch | D14 & D19 | Clock/Ambient Temp. Switch In ON Position | Continuity |
| Odometer & Twin Trip Switch | D14 & D19 | Clock/Ambient Temp. Switch In OFF Position | No Continuity |
| Odometer & Twin Trip Switch | D14 & B10 | A/B Switch In ON Position | Continuity |
| Odometer & Twin Trip Switch | D14 & B10 | A/B Switch In OFF Position | No Continuity |
| Odometer & Twin Trip Switch | D14 & B11 | Reset Switch In ON Position | Continuity |
| Odometer & Twin Trip Switch | D14 & B11 | Reset Switch In OFF Position | No Continuity |
| Door Courtesy Switch | D15 & Ground | Driver's & Passenger's Door Open | Continuity |
| Door Courtesy Switch | D15 & Ground | Driver's & Passenger's Door Closed | No Continuity |
| Fuel Gauge Sending Unit | D22 & C15 | Float In FULL Position | About 3 Ohms |
| Fuel Gauge Sending Unit | D22 & C15 | Float In 1/2 Position | About 30.8 Ohms |
| Fuel Gauge Sending Unit | D22 & C15 | Float In EMPTY Position | About 110 Ohms |
| Ground | D23 & Ground | Constant | Continuity |
| Ground | A2 & Ground | Constant | Continuity |
| Engine Oil Level Warning Switch | A8 & Ground | Oil Temp. Less Than 131°F (55°C) | Continuity |
| Engine Oil Level Warning Switch | A8 & Ground | Oil Temp. Greater Than 131°F (55°C) With Float Up | Continuity |
| Engine Oil Level Warning Switch | A8 & Ground | Oil Temp. Greater Than 131°F (55°C) With Float Down | No Continuity |
| PNP Switch | B6 & Ground | Shift Lever In "P" Position | Battery Voltage |
| PNP Switch | B7 & Ground | Shift Lever In "R" Position | Battery Voltage |
| PNP Switch | B8 & Ground | Shift Lever In "N" Position | Battery Voltage |
| PNP Switch | A10 & Ground | Shift Lever In "D" Position | Battery Voltage |
| PNP Switch | B9 & Ground | Shift Lever In "3" (SC300) Or "4" (SC400) Position | Battery Voltage |
| PNP Switch | B12 & Ground | Shift Lever In "2" (SC300) Or "3" (SC400) Position | Battery Voltage |
| HEAD Fuse (SC400) | B2 & Ground | Headlights On & Dimmer Switch In HI Or FLASH Position | Battery Voltage |
| HEAD Fuse (SC400) | B2 & Ground | Headlights On & Dimmer Switch In ON Position | Zero Voltage |
| Headlight Dimmer Switch | B3 & Ground | Constant (SC300) | Battery Voltage |
| Headlight Dimmer Switch | B3 & Ground | Dimmer Switch In HI Or FLASH Position (SC400) | Battery Voltage |
| Headlight (SC400) | B4 & Ground | Constant | Continuity |
| Transmission Shift Pattern Select Switch | B13 & Ground | Ignition On & Select Switch In PWR Position | Battery Voltage |
| Transmission Shift Pattern Select Switch | B13 & Ground | Ignition On & Select Switch In NORM Position | Zero Volts |
| Washer Level Warning Switch | C5 & Ground | Float Down | Continuity |
| Washer Level Warning Switch | C5 & Ground | Float Up | No Continuity |
| Brake Fluid Level Warning Switch | C8 & Ground | Float Down | Continuity |
| Brake Fluid Level Warning Switch | C8 & Ground | Float Up | No Continuity |
| Parking Brake Switch | C8 & Ground | Pedal Depressed | Continuity |
| Parking Brake Switch | C8 & Ground | Pedal Released | No Continuity |
| ECU-B Fuse | C10 & Ground | Constant | Battery Voltage |
| Generator "L" Terminal | C12 & Ground | Engine Off | Continuity |
| Generator "L" Terminal | C13 & Ground | Engine Running | Battery Voltage |
| Low Oil Pressure Warning Switch | C14 & Ground | Engine Running | No Continuity |
| Low Oil Pressure Warning Switch | C14 & Ground | Engine Off | Continuity |
| Fuel Gauge Sending Unit | C16 & Ground | Fuel Tank Full | No Continuity |
| Fuel Gauge Sending Unit | C16 & Ground | Fuel Tank Empty | Continuity |