Preliminary Information

Except while taking resistance readings, ignition switch should be in RUN position. Ensure negative battery cable is disconnected.
Perform all resistance measurements to ground unless a specific terminal number is given. If voltage or resistance is correct, check circuit for malfunction using appropriate test.
If voltage or resistance is correct but function using those terminals is incorrect, check instrument cluster bulbs. If bulbs are okay, replace instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION.

Fig 1: Identifying Instrument Cluster Connector Terminals

Courtesy of GENERAL MOTORS CORP.

INSTRUMENT CLUSTER CONNECTOR PINOUT TEST ⁽¹⁾

Cavity

Wire Color

Description

A1 ⁽²⁾

PNK

Power Feed From Gauges Fuse

PPL

Fuel Gauge Input

GRY

Security Indicator

BRN/WHT

Service Engine Soon Indicator

A5 ⁽²⁾

PNK

Power Feed From Gauges Fuse

YEL/BLK

Low Coolant Indicator

BRN

Air Bag Indicator

A10

TAN/WHT

Brake Indicator

A11 ⁽³⁾

LT GRN

High Beam Indicator

A12

YEL

Fasten Belts Indicator

A13 ⁽⁴⁾

ORN

Power Feed From ECM BAT Fuse

A14

RED

Charging System Indicator

A15

BRN

Oil Level Indicator

A16

DK BLU

ABS Active Indicator

A17

DK GRN

Coolant Temp. Gauge

B2 ⁽⁵⁾

GRY

Instrument Illumination

BLK

Ground

B5 ⁽⁶⁾

DK BLU

Right Turn Signal

B12

YEL

Vehicle Speed Input

B13

ORN

Tachometer Input

B14 ⁽⁶⁾

LT BLU

Left Turn Signal

B15

BLK/WHT

Ground

B16

TAN

Oil Pressure Indicator

B17

LT GRN

ABS Failure Warning

⁽¹⁾	Cavities not shown are NOT USED.

⁽²⁾	Battery voltage with ignition on.

⁽³⁾	Battery voltage with headlights on.

⁽⁴⁾	Battery voltage at all times.

⁽⁵⁾	Voltage varies with rheostat adjustment.

⁽⁶⁾	Battery voltage when flashing.