GMC chervolet camaro 1999 Service Manual page 663

5-188 Antilock Brake System Brakes
OTC C0161 ABSITCS Brake Switch Circuit Malfunction
Circuit Description
O.SORN
0.8 ORN 140 140
A C1
~
! ...
'j
St~plamp 0.8 LT BLU 20
I
I
1 Switch
1 • •..• , I (Closed
With
" - .ii-.,
pedal depressed)
B C1
0.8 LT BLU 20
6 2 4 3 - - - - - - - - - J
0.8LTBW 20
A4 C200A
C200D
P100
0.8LTBLU
S154
0.8 LT BLU 20
20
6 C1
r sio;;ia;p,-,
Electronic
: switch
I
Brake And Traction
1npu1
I Control
1 1
Module
1
.,,.
1
(EBCM/EBTCM)
I I
.&
I I ,.
"------"~
• Thoroughly inspect any circuitry that may be
213295
The Stoplamp Switch is a normally open switch, when
the brake pedal is depressed the EBCM/EBTCM
causing the complaint for the following conditions:
will sense battery voltage. This allows the
EBCM/EBTCM to determine the state of the
brake lamps.
Conditions for Setting the DTC
• EBCM/EBTCM detects battery voltage at all times.
• EBCM/EBTCM never detects battery voltage
from CKT 20.
• Both brake lamps are faulty.
Action Taken When the DTC Sets
• DTC C0161 is set.
• ABS and TCS remains active.
Conditions for Clearing the DTC
• The condition responsible for setting the DTC no
longer exists and the scan tool Clear DTCs
function is used.
• 100 ignition cycles pass with no DTCs detected.
- Backed out terminals
- Improper mating
- Broken locks
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Physical damage to the wiring harness
• 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 Cell 4 in Electrical
Diagnosis for further diagnosis.
Test Description
(
(
Diagnostic Aids
• It is very important that a thorough inspection of
the wiring and connectors be performed. Failure
to carefully and fully inspect wiring and connectors
may result in misdiagnosis, causing part
replacement with reappearance of the malfunction.
The numbers below refer to the step numbers on the
diagnostic table.
5. This step checks for voltage at the EBCM/EBTCM. (
11. This step checks the Stoplamp switch.