Analog
The Instrument Cluster contains gauges and warning indicators to keep the driver informed about the vehicle's systems. When the park lamps or headlamps are turned on, the Instrument cluster is illuminated. See Cell 71 for more information about Instrument illumination.
Speedometer Assembly
The Speedometer Assembly includes the Speedometer, the Odometer and the Trip Odometer. All three are electronically controlled by a solid state device that uses an input signal from the Vehicle Speed Sensor (VSS).
The Speedometer Assembly (-17255-) is serviceable only as a unit. It is important to keep the speedometer face up, since speedometer function will be affected by storage in the face down position.
Temperature And Fuel Level Gauges
The Temperature and Fuel Level Gauges are magnetic gauges. With this type of gauge, the gauge needle "balances" between two magnetic fields that are present inside the gauge. One of these fields remains at a constant strength at all times. The other field varies in strength according to current flow through the field's winding. Current flow through the winding is determined by gauge sender resistance. With low sender resistance, current flow through the coil is high; with high sender resistance, current flow through the coil is low.
Temperature Gauge
The Coolant Temperature Sender determines current flow through the Temperature Gauge winding. With low coolant temperature, Sender resistance is high (about 74 ohms) and current flow is low. The needle points to "C." As coolant temperature increases, sender resistance decreases (to about 10 ohms with a very hot engine) and current flow increases. The needle moves toward "H."
Fuel Gauge
The Fuel Gauge Sender determines current flow through the Fuel Gauge winding. With a full fuel tank, Sender resistance is high (about 145 ohms) and current flow is low. The needle points to "F." As the fuel level drops, Sender decreases (to about 23 ohms with an empty tank) and current flow increases. The needle moves toward "E."
Warning Indicators
with the Ignition Switch in START or RUN, voltage is present at the AIR BAG, ANTI-LOCK BRAKE, Brake, CHECK ENGINE, CHECK TEMP and Low Fuel Warning Indicator bulbs through Fuse 13 and circuit 640 (R/Y). The bulb for each indicator is grounded under the conditions described below.
AIR BAG Indicators
If an Air Bag System fault is present, the Air bag Diagnostic Module grounds pin 54. Current flows through the Air Bag Indicator circuit 608 (BK/Y) and the Air Bag Diagnostic Module to ground: the Indicator illuminates.
ANTI-LOCK Indicator
If an Anti-Lock Brake System fault is present, the Anti-Lock Brake Module grounds pin 52. Current flows through the ANTI-LOCK Indicator, circuit 603 (DG) and the Anti-Lock Brake Module to ground: the Indicator illuminates.
Brake Indicator
With the Ignition Switch in START, circuits 977 (P/W) and 57 (BK) are connected through the Ignition Switch contacts. This circuit is used as a bulb test for the Brake Indicator during engine start up.
With a low brake fluid condition, the Brake fluid Level Switch contacts close, grounding the Brake Indicator. Current flows through the Brake Indicator, circuit 977 (P/W), the Brake Fluid Level Switch and circuit 57 (BK) to ground: the Indicator illuminates.
If the Park Brake is applied, the Park Brake Switch contacts close. On standard production vehicles, current flows through the Brake indicator, circuits 977 (P/W) and 512 (T/LG) and the Park Brake Switch to ground: the Indicator illuminates.
On non-standard production vehicles, the park brake part of the Brake Indicator circuit is slightly different from that of standard production vehicles.
While all non-standard production vehicles are wired for Daytime Running Lamps (DRL), only vehicles sold in Canada have a DRL Module installed. Cars sold in the United States have a DRL Module Jumper plugged into the DRL Module connector C180. This Jumper has two circuits. One connects circuits 977 (P/W) and 512 (R/LG). Whether a DRL Module or DRL Module Jumper is installed, the Park Brake Switch Signal is still used to ground the Brake Indicator.
CHECK ENGINE Indicator
With a fault present in the Electronic Engine Control System, the Electronic Engine control (EEC) Module grounds pin 17. Current flows through the CHECK ENGINE Indicator, circuit 201 (T/R) and the EEC Module to ground: the Indicator illuminates.
CHECK TEMP Indicator
If engine temperature exceeds a predetermined value, the electronic Engine Control (EEC) Module grounds pin 53. Current flows through the CHECK TEMP Indicator, circuit 737 (W/LB) and the EEC Module to ground: the Indicator illuminates.
Low Fuel Warning Indicator
When fuel level drops to a predetermined level (about 1/8 tank remaining), the Anti-Slosh Module grounds the Low Fuel Indicator, causing it to illuminate.
Oil Pressure Indicator
With low oil pressure (or with the engine shut off), the Oil Pressure Switch is closed. Current flows through the Oil Pressure Indicator, circuit 31 (W/R) and the Oil Pressure Switch to ground: the Indicator illuminates. With oil pressure above about 6 psi, the Switch opens, opening the ground circuit, and the Indicator turns off.
AIR SUSPENSION INDICATOR
Voltage is present at the AIR SUSPENSION Indicator at all times through the AIR SUSPENSION PUMP Fuse and circuit 417 (P/O).
If an Air Suspension fault is present, the Air Suspension/EVO Steering Module grounds pin 11. Current flows through the Air Suspension Indicator, circuit 419 (DG/LG) and the Air Suspension/EVO Steering Module to ground: the Indicator illuminates.
Charge Indicator
With the Ignition Switch in RUN, voltage is present at the Charge Indicator through Fuse 15 and circuit 88 (BK/W).
With the engine not running, or with the engine running and the alternator output below a preset value, the Alternator grounds the Charge Indicator bulb through circuit 904 (LG/R). Current flows through the Charge Indicator; circuit 904 (LG/R) and the Alternator to ground: the Indicator illuminates.
If the engine is running and the charging system is working properly, the Alternator "ungrounds" circuit 904 (LG/R) and the Indicator turns off.
On vehicles equipped with the Heated Windshield, the Alternator signal passes through the Heated Windshield Module. See Cell 57 for more information.
Unlike the other Warning Indicators, the Fasten Belts, Hi Beam and Turn Indicator bulbs are grounded at all times. Each bulb is then powered under the conditions described below.
Fasten Belts Indicator
When the Ignition Switch is turned to RUN or START, the Warning Chime Module applies voltage to circuit 450 (DG/LG) to illuminate the Fasten Seat Belts Indicator for six seconds, whether or not the driver's seat belt is buckled.
Hi Beam Indicator
With the headlamps turned on and the Main Light Switch Dimmer in the Hi Beam position, voltage is present on circuit 932 (GY/W) at the Hi beam Indicator and the Indicator illuminates.
On DRL-equipped vehicles, the Main Light Switch Dimmer Switch does not power the Hi beam Indicator directly. Instead, the Dimmer Switch applies voltage to pin 8 of the DRL Module and the Module applies voltage to circuit 932 (GY/W) at pin 1.
Left and Right Turn Indicators
With the Multi-Function Switch in the left or right turn position, voltage is applied to circuit 3 (LG/W) or 2 (W/LB) to illuminate the Left or Right Turn Indicator. The Turn Indicator flashes in unison with the exterior turn signal bulbs.