Car Check System - Troubleshooting Guide: Overview
83audi02Applies To Audi 5000S 1984
CIS
Group
96
Subject: Car Check System
Part Identifier
Key Points Troubleshooting Guide
Number
83-01
August 16, 1983
It is not possible at present to test main control unit of Auto Check System. If measurements for individual circuit tests are within specification, main control unit is defective and should be replaced.
After switching ignition and headlights ON and depressing brake pedal, the following functions or conditions will be checked and indicated on display unit in instrument cluster and by acoustic signal:
- brake fluid level
- operating pressure in brake servo
- brake lights
- front brake pad wear
- fluid level in central hydraulic system
- fluid level in cooling system
- coolant temperature
- engine oil pressure
- fluid level in windshield washer system
- fuel level
- rear lights
- low beam headlights
- battery voltage.
If Auto Check system button is depressed (instrument cluster illumination control), individual warning symbols will light up one after the other.
Malfunctions are classified in two groups:
- Warning display brake lights brake pad wear low beam headlights rear lights battery voltage windshield washer fluid level fuel level
If a defect occurs in "warning display" group, appropriate symbol or letters will appear with or without a yellow triangle. In addition, an acoustic signal will sound once. Fluid levels (brake, coolant, windshield washer) are displayed as long as the alternator charge warning light (terminal 61) is connected to ground. If several defects in "warning display" group are present at the same time, appropriate symbols are displayed one after the other. Only "brake pad wear" symbol appears for as long as the ignition is switched ON.
- Danger display brake fluid level brake pressure hydraulic fluid level engine oil pressure coolant temperature too high coolant level
If a defect occurs in "danger display" group, appropriate symbol appears in display unit with an illuminated red triangle. In addition, an acoustic signal sounds three times. Defects are not stored in the system memory. Other defect displays are suppressed whenever there is more than one defect in this group.