Auto Check System - Checking/Troubleshooting
Group: 96Number: 91-02
Date: November 30, 1991
Subject:
Auto-check system, checking/troubleshooting
Model(s):
100, 100S, 100CS 1992 m.y.
Index
Auto-check system
^ code, checking
^ operation
^ troubleshooting
Frequency display
^ troubleshooting
AUTO-CHECK SYSTEM, OPERATION
Note
When performing the display check for the Autocheck system, yellow and red displays should illuminate. If not, check relevant bulbs.
AUTO-CHECK CODE, CHECKING
Note
The Auto-check display check button is incorporated into the instrument panel dimmer switch.
^ switch ignition OFF
^ press and hold Auto-check display check button on instrument cluster
^ switch ignition ON
^ two-digit code appears in Auto-check display
first digit: number of cylinders
second digit: position of coding switch (see illustration)
Example:
62 = 6 cyl., USA, gasoline
Coding switch positions
^ adjust coding switch (arrow) to position 2 (USA) or position 3 (Canada)
AUTO CHECK SYSTEM, TROUBLESHOOTING
General notes
See Repair Group 90 for instrument cluster and instrument cluster component removing/installing procedures.
See wiring diagrams and Repair Group 97 for locations of Auto-check system components in engine compartment.
If all specified values are obtained during troubleshooting and Auto-check system continues to malfunction,
^ replace Auto-check system/Board computer printed circuit board
If incorrectly formed symbols or lines appear on display,
^ replace Auto-check system/Board computer display unit
Before replacing a defective component,
^ check wiring to component for open/short circuits according to wiring diagram, repair as necessary
If Auto-check system display is dim,
^ check bulbs, see Repair Group 90 for bulb positions
Test conditions
^ battery OK
^ fuse S8 OK
^ fuse S15 OK
^ Auto-check system coding switch set properly
^ voltage stabilizer OK (checking, Repair Group 90)
^ use digital multimeter Fluke 83 (US 1119), connector test kit VW 1594, Test box VAG 1598, adaptor harness VAG 1598/4 and test adaptor VAG 1594/20 when performing electrical checks
^ always refer to appropriate wiring diagram when troubleshooting
Note
If available, use adaptor harness VAG 1598/13 in place of test adaptor VAG 1594/20.
Instrument Cluster Tests
FREQUENCY DISPLAY, TROUBLESHOOTING
When the Auto-check system is not being used and the radio is on, the radio station frequency or the tape player in-use symbol will be displayed in the Autocheck display.
Example:
89.5 = radio frequency indicator
infinity (symbol) = stereo/mono indicator
FM2.4 = station select button indicator
TAPE = tape operation
If Frequency Display Does Not Work, use illustration and flow chart below.
Illustration/Flow Chart