GMC chevrolet camaro 2000 Service Manual page 648

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Brakes Antilock Brake System 5-175
DTC C0161 ABS/TCS Brake Switch Circuit Malfunction
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Hot At All Times
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:. Distribution. H1 STOP/HAZARD I
Fuse
JLoc
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Schematics Fuss 1
I
Block
in Wiring G1 20 A I
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Systems · ·
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~
L..1il
Circuit Description
. _ _______ ------.1
0.8 ORN 140
A C1
O.SORN
140
Exterior Ughts
Schematics in · ·
Lighting Systems
, -1'- ,
Stoplamp
0.8
LT
BLU 20
1 /
1
Switch
I
•-.A
I (Closed with
1.. -
.lY
.1
pedal depressed)
B C1
0.8 LT BLU 20
8243
.--------.....i
0.8
LT
BlU
20
A4 C200D
C200A.
PiOO
0;8 LT BLU
$154..----,-,,'----'---li>-
0.8
LT
BLU
20
20
s .c1
' " ; 0 ; ~
1-:-. ,
Electronic Brake
I Switch I
Control Module
I
Input
I (EBCM)
:
.
-:
:
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V8VING
Cruise
Control
Schematics
in Cruise
Control
V6VINK
Engine
Controls
Schematics
in Engine
controls
3.8L
" Thoroughly inspect any circl,lifry that may be
519727
The Stoplamp Switch is a normally open switch, when
the brake pedal is depressed the EBCM will sense ·
battery voltage. This allows the EBCM to determine the
state of. the brake lamps:
causing the complaint for the following conditions:
Conditions for Setting the DTC
• EBCM detects batt~ry voltage at all times.
• EBCM never detects battery voltage from CKT 20.
• Both brake lamps are faulty.
Action Taken When the OTC Sets
• DTC C0161
is
set.
O
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,
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.
- 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
Testing for Intermittent and Poor Connections in
Wiring Systems.
. Test Description
The numbers below refer to the step numbers on the
diagnostic table.
5. This step checks for voltage at the EBCM.
11. This step checks the Stoplamp switch.