GMC chervolet camaro 1999 Service Manual page 701

5-226 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 Systems tor
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 Traction
Control Switch message froin ,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 Traction Control
Switch is at fault.
TCS Off Indicator On with No OTC Set
Step
Action
Value(s)
Yes No
DEFINITION: TCS 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 Check
1. Turn the ignition switch to the RUN position,
engine off.
2. Using a scan tool enter TCS Data List.
2
3. While monitoring the TCS On/Off switch status, press
-
and release the TCS On/Off switch.
Does the switch status change from pressed to released
as the TCS switch is pressed and released?
Go to Step 3 Go to Step5
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 turn on or off the
-
instrument. panel indicators.
4. All indicators will turn ON when commanded on.
Does the TCS OFF indicator tum 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
4
circuit to cluster.
-
-
3. Test Light ON, Check the connector for poor
connection to 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 Traction Control Switch and disconnect
the connector. Refer to
5
2. Using a scan tool in ABS/TC Data List read the
-
TCS Switch Status.
3. With the Traction Control Switch disconnected.
Does the TCS Switch status read released? Go to Step 6
Go to Step 7
(