Instrument Panel, Gauges and Warning Indicators: Description and Operation

WARNING LAMPS

System Description

OUTLINE
With ignition switch in the ON or START position, power is supplied
- through 10 A fuse [No. 14, located in the fuse block (J/B)]
- to combination meter terminals 17 and 18.

Ground is supplied
- to combination meter terminals 6 and 39
- through body grounds M57 and M61 and
- to seat belt buckle switch terminal 2
- through body grounds B7 and B19, and
- to brake fluid level switch terminal 1
- through body grounds E15 and E24, and
- to washer level switch terminal +
- through body grounds E115 and E129.

AIR BAG WARNING LAMP
During prove out or when an air bag malfunction occurs, the ground path is interrupted
- from the air bag diagnosis sensor unit terminal 15
- to combination meter terminal 38.

Ground is supplied
- through combination meter terminals 6 and 39.

When power and ground are supplied, the air bag warning lamp illuminates.

DOOR WARNING LAMP
Door warning lamp is controlled by the BCM.

When one of the doors is opened, ground is supplied to the BCM terminals 10, 11, 14 or 54. The BCM then signals the combination meter (unified meter control unit) via the CAN lines and ground is provided to the door warning lamp.

When power and ground are supplied, the door warning lamp illuminates.

LOW OIL PRESSURE WARNING LAMP
Low oil pressure warning lamp is controlled by the IPDM E/R (Intelligent Power Distribution Module Engine Room).

Low oil pressure causes oil pressure switch terminal + to provide ground to IPDM E/R terminal 50. The IPDM E/R then signals the combination meter (unified meter control unit) via the CAN lines and ground is provided to the low oil pressure warning lamp.

When power and ground are supplied, the low oil pressure warning lamp illuminates.

CHARGE WARNING LAMP
During prove out or when a alternator malfunction occurs, ground is supplied
- to combination meter terminal 24
- from generator terminal L.

When power and ground are supplied, the charge warning lamp and brake lamp illuminate.

LOW WASHER LEVEL WARNING LAMP
When the washer fluid level is low, ground is supplied
- to combination meter terminal 22
- from washer fluid level switch terminal +.

When power and ground are supplied, the low washer level warning lamp illuminates.

LOW FUEL LEVEL WARNING LAMP
The amount of fuel in the fuel tank is determined by the fuel level sensor in the fuel tank. A signal is sent
- to combination meter terminal 12
- from fuel level sensor unit terminal G.

The fuel level sensor will illuminate the low fuel level warning lamp when the fuel level is low. When power and ground are supplied, the low fuel level warning lamp illuminates.

ABS WARNING LAMP
When an ABS malfunction occurs, ground is supplied
- to combination meter terminal 25
- from ABS actuator and electric unit (control unit) terminal 21.

When power and ground are supplied, the ABS warning lamp illuminates.

TCS OFF WARNING LAMP
When TCS OFF switch is in OFF position, or an TCS malfunction occurs, ground is supplied
- to combination meter terminal 26
- from ABS actuator and electric unit (control unit) terminal 26.

When power and ground are supplied, the TCS OFF warning lamp illuminates.

SLIP WARNING LAMP
When TCS is in operation, or a TCS malfunction occurs, ground is supplied
- to combination meter terminal 27
- from ABS actuator and electric unit (control unit) terminal 28.

When power and ground are supplied, the slip warning lamp illuminates.

SEAT BELT WARNING LAMP
When the drivers seat belt is unfastened, ground is supplied
- to combination meter terminal 28
- from seat belt buckle switch terminal 1.

When power and ground are supplied, the seat belt warning lamp illuminates.

BRAKE WARNING LAMP
When the parking brake is applied, or if the brake fluid level is low, ground is supplied
- to combination meter terminal 36
- from parking brake switch terminal 1 or
- to combination meter terminal 37
- from brake fluid level switch terminal 1.

When power and ground are supplied, the brake warning lamp illuminates.

MALFUNCTION INDICATOR LAMP
During prove out or when an engine control malfunction occurs, ground is supplied
- to combination meter terminal 23
- from ECM terminal 18 (QR25DE engines) or terminal 33 (VQ35DE engines).

When power and ground are supplied, the malfunction indicator lamp illuminates.

CRUISE INDICATOR LAMP
The cruise indicator lamp is controlled by the ECM.

When the ASCD system is turned on, the ECM signals the combination meter (unified meter control unit) via the CAN lines and ground is provided to the cruise indicator lamp.

When power and ground are supplied, the cruise indicator lamp illuminates.

ASCD SET INDICATOR LAMP
The ASCD set indicator lamp is controlled by the ECM.

When the ASCD system is turned on and the speed is set, the ECM signals the combination meter (unified meter control unit) via the CAN lines and ground is provided to the set indicator lamp.

When power and ground are supplied, the set indicator lamp illuminates.

CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.