GMC chervolet camaro 1999 Service Manual page 704

Brakes
• 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.
Antilock Brake System 5-229
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 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 Traction Control
Switch is at fault.
TCS Off Indicator Inoperative with No DTC Set
Step Action
Value(s)
Yes No
DEFINITION: TCS Off indicator is Inoperative when attempting to disable traction control.
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
Go to Step 3
Go to Step 5
as the TCS switch is pressed and released?
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 turn on then off? Go to Step 11
Go to Step 4
1. Disconnect 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 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 Traction Control Switch
Replacement (Chevrolet)
2. Using a scan tool in ABS/TC Data List read the
5
TCS Switch Status.
-
3. Connect a jumper wire between terminals E and F of
the Traction Control Switch harness connector.
Does the TCS Switch status read pressed with the jumper
wire connected? Go to Step 6
Go to Step 7
Replace the Traction Control Switch. Refer to Traction
Goto ABS
6
Control Switch Replacement (Chevrolet).
-
Diagnostic
-
Is the replacement complete? System Check