GMC chervolet camaro 1999 Service Manual page 707

5-232 Antilock Brake System
• The following conditions may cause an intermittent
malfunction:
- A poor connection
- Rubbed-through wire insulation
- A broken wire inside the insulation
• If an intermittent malfunction exists refer to
Troubleshooting Procedures in Wiring System for
further diagnosis.
Brakes
Test Description
The number(s) below refer to the step number(s) on
the diagnostic table.
2. Checks if EBCM/EBTCM is receiving a
ASR Switch message from the switch.
3. Checks if the scan tool can turn on and off all the
indicator lamps in the instrument cluster.
5. Checks if the EBCM/EBTCM or ASR Switch is
at fault.
ASR Indicator On with No OTC Set
Step
I
Action
Value(s)
Yes
No
DEFINITION: ASR Off indicator is on and traction control was not turned off. There are no DTC(s) set.
Was the Diagnostic System Check performed? Go to ABS
1
-
Diagnostic
Go to Step2 System Cfieck
1. Tum the ignition switch to the RUN position,
engine off.
2. Using a scan tool enter TCS Data List.
2
3, While monitoring the ASR On/Off switch status, press
-
and release the ASR On/Off switch.
Does the switch status change from pressed to released
as the ASR switch is pressed and released?
Go toStep3 Go to Step 5
1. Using a scan tool in the instrument Pannel Cluster
Special Function.
2. Go to WOW Instrument Panel in Output Control.
3 3. In the WOW mode you can tum on or off the
-
instrument panel indicators.
4. All indicators will turn ON when commanded on.
Does the ASR OFF indicator turn on then off?
Go to Step 9
Go to Step 4
1. Disconnect the instrument cluster and connect a Test
light across the appropraiate power and ground
terminals.
2. Test light OFF, repair open in power or ground circuit
to cluster.
4
-
-
3. Test light ON, check connector for poor connection to
the cluster.
4. If OK, replace the instrument cluster IP Cluster
Go to Step ABS
Replacement.
Diagnostic
Is the instrument cluster replacement complete?
System Check
1. Remove the ASR Switch and disconnect the
connector. Refer to Traction Control Switch
Replacement {Chevrolet).
5
2. Using a scan tool in ABS/TC Data List read the
-
res
Switch Status.
3. With the ASR Switch disconnected.
Does the TCS switch status read released? Go to Step 6 Go to Step 7
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(