1999 HONDA CIVIC ac system

Power Door Locks
Control Unit lnput Test ('96 - 98 models and'99 - 00 models without
Keyless Entry Systeml (cont'dl
Disconnect the 12P connector from the power door lock control unit.
CAUTION: To prevsnt damage to the actuator, apply battery voltage only momentarily.
Cavity WireTest conditionTest: Desired resultPossible cause if result is nol obtained
*: With keyless entry system
Reconnect the 12P connector to the power door lock control unit.
Cavity WireTest conditionTssl: Desirsd losullPossible cause it resull b not obtained
4BLKUnder all conditionsCheck for continuity to ground:
There should be continuity.
. Poor ground (G55'l ). An open in the wire
WHT/GRN
Under all conditionsCheck for voltage to ground:
There should be battery voltage.
. Blown No. 51 (20 A)fuse in the
under-hood fuse/relay box. An open in the wire
2YEURED
Connect the YEURED
terminal to the WHT/
GRN terminal, and the
WHT/RED terminal to
the BLK terminal
momenraflty.
Check door lock operation:
All passenger's doors should
untocK.
Blown No. 51 {20 A) fuse in the
under-hood fuse/relay box
Faulty actuator
An open in the wire
3BLU/RED
Connect the BLU/RED
terminal to the WHT/
GRN terminal. and the
WHT/RED terminal to
the BLK terminal
momenraflry.
Check door lock operation:
Driver's door should unlock.
5WHT/RED
connect the WHT/RED
terminal to the WHT/
GRN terminal, and the
YEL/RED terminal to
the BLK terminal
momenrafl ty.
Check door lock operation:
All passenger doors should lock.
BLU/YEL
Under all conditions.Check for continuity between the
power door lock control unit l2P
connector No. 6 terminal and
audio unit 16P connector No. 3 ter-
minal: The.e should be continuity.
An open in the wire
GRN,ryVHTDriver's door lock
switch in LOCK
Check for voltage to ground:
There should be 1 V or less.
Faulty driver's door lock switch
Poor ground {G551)
An open in the wire
8GRN/ORNDriver's door lock
switch in UNLOCK
7BLUA/VHT
Driver's door lock knob
in LOCK
Check for voltage to ground:
There should be 1 V or less.
Faulty driver's door lock actuator
Poor ground {G551)
An open in the wire

)Control Unit Input Test ('99 - 00 models with Keyless Entry System)
1.Remove the driver's kick panel.
Disconnect the 18P connector from the control unit.
Inspect the connector and socket terminals to be sure they are all making good contacl.
. lf the terminals are bent, loose or corroded, repair them as necessary, and recheck the system
. lf the terminals look OK, make rhe following input tests at the connector.
- lf anv test indicates a problem, find and correct the cause, then recheck ihe system
- lf all the input tests prove OK, the control unit must be faulty; replace it
Wire side oI female terminals
Disconnect the 18P connector from the power door lock control unit.
CAUTION: To provent damage to the actuator, apply battery Yoltage only momentarily.
Cavity Wir€ Test conditionTest: Desired resultPossible cause if result is not obtained
BLK/YELRED/SLK
25618
910/,'2 ,/
'151718
LTWHT
17BLKUnder all conditionsCheck for contlnuity to ground:
There should be continuity.
. Poor ground (G551)
. An open in the wire
t8WHT/GRN
Under all conditionsCheck tor voltage to ground:
There should be battery voltage.
. Blown No. 5'1 (20 A) luse in the
under-hood tuse/relay box
. An open in the wire
4B LK/YEL
lgnition switch ON (ll)check for voltage to ground:
There should be battery voltage.
Blown No. l4 (7.5 A) fuse in the
under-dash fuse/relay box
An open in the wire
(cont'd)
23-259
l-r

Power Door Locks
Control Unit Input Test ('99 - 00 models with Keyless Entry System) (cont'd)
BLU/RED WHT/RED
8LU/WHT8LK/YELRED/BLK
2345618
91012/t/t517td
LT GRN,/RED
BLK
Wire side of female terminals
Disconnect the 18P connector from the oower door lock control unit.
CAUTION: To prevent damage to the actuator, apply baftery voltage only momentarily.
Cavity WileTest conditionTest: Desired resultPossible cause if result is not obtained
BLU/RED
YEL/RED
WHT/GRN
GRN/WHT
IYEURED
Connect the YEURED
terminal to the WHT/
GRN terminal, and the
WHT/RED terminal to
the BLK terminal
momenraflty,
Check door lock operation:
All passenger's doors should
untocK.
Blown No. 51 (20 A) fuse in the
under-hood fuse/relay box
Faulty actuator
An open in the wire
5BLU/RED
Connect rhe BLU/RED1
terminal to the WHT/
GRN terminal, and the
WHT/RED terminal to
the BLK terminal
momenlaflry_
Check door lock operation:
Driver's door should unlock.
7WHT/RED
Connect the WHT/RED
terminal to the WHT/
GRN terminal, and the
YEURED terminal to
the BLK terminal
momenlaflry.
Check door lock operation:
All passenger doors should lock.
23-260

Power Door Locks
Audio Unit {Keyless Receiver Circuitl Input Test ('96 - 98 models}
Remove the audio unit, then disconnect the A and B connectors (see page 23-189).
Inspect the connector and socket terminals to be sure they are all making good contact
. lf the terminals are bent, loose or corroded, repair them as necessary, and recheck the system
. lf the terminals look OK, make the following input tests at the connector.
- lf anv test indicates a problem, find and correct the cause, then recheck the system
lf all the inout tests prove OK, the control unit must be faulty; replace it.
A CONNECTOBB CONNECTOR
16P CONNECTORS
AUDIO UNIT
L
2.
WHT/BLU YEL/RED
{KEYLESS RECEIVER CIRCUIT}
23-262

Power Door Locks
Audio Unit lKeyless Receiver
Circuitl Terminals ('96 - 98 modelsl
CavityWireDestination
16P CONNECTOR
B1BLU/REDlgnition key switch
*82LT GRNTrunk latch switch
Ft2BLU/YELUnlock (Driver's door)
B4BLUValet switch
*85LT BLUSecurity {lN)
B6BLK/YE LNo. 14 (7.5 A) fuse
*81ORNSecurity (D2)
B8LT GRN/BLKCeiling light
B9GRN/ORNUnlock (All doors)
810GRNA/VHTLock (OutPutl
*811BLU/WHTLED O
*812WHT/BLKSecurity (D0)
+B 13YEL/BLUSecurity (D'l )
814LT GRN/REDDoor switch
B15BLKG round (G401, G402)
o toGRYnorn
*: For security system (option)
23-264
Driver's Door Lock Switch Test
1. Remove the inner handle (see section 20).
2. Disconnect the 3P connector from the door lock
switch.
Check for continuity between the terminals in each
switch position according to the table.
DRIVER'SDOORLOCKswtTcH
Terminal
Position123
LOCKo-----o
OFF
UNLOCKo----o

)
Transmitter Programming ('96 - 98 models)
Storing Transmitter Codes
. The codes of up to four transmitters can be stored in the control unit. {lf a {ifth code is stored, the code which was
stored tirst will be erased.)
. When the system enters the registration mode, all previously slored codes will be erased.
. The system leaves the registration mode and returns to the normal mode if you
- turn the valet swirch OFF, or
- turn the ignition switch OFF, or
- do not press the transmitter button for more than 10 seconds
Procedure:
NOTE: lt is important to maintain the time limits between steps
VALET SWITCH
NOTE: lf the tuner is turned ON, it willgo off and come on again when the reg-
istration procedure is completed-
l-l
NOTE: lf you want to register the codesof more than one transmitter, repeat step4 within 10 seconds with the next trans'mitter.
NOTE: After storing its code, make sure
the transmitter works properly bYrepeatedly pressing one ot its buttons.(The system starts to work when Youpress any transmitter button six times-)
TRANSMTITTER
23-267
--
Insert the ignition key into the
ignition swatch.Turn the ignit;on switch ON
flr).
Within 10 seconds, go to steP 3.
3. Press and hold the valet switchfor at least tive seconds.(You will hear the sound of theactuators turnang to UNLOCK.)
Within 10 seconds. go to step 4.
4. Press one of the transmitterbuttons,(You will hear the sound of theactuators turning to UNLOCK.i
AUDIO UNIT

)
Troubleshooting
Sef f -dia gnostic Proctdurcs ............. 2+13
Reading the DTC .............................. 2+13
Erasing the DTC Mcnrory ................ 24-15
Troubleshooting h.ttnitt.nt
Failures ..............24-15
SRS U n it ldcntificrtion .................... 24- 1 6
Diagnostic Troublc Code (DTC)
Chart - '96 - 97 Models..."'."....... 24-17
Diagnostic Trouble Code (DTCI
Chart - '$ - 00 Models '.........""' 24'19
SRS lndicaror Light Wire
connections ...'.,24-25
Ff owcharts ........,,,,.24-26
Airbag
Repfacemant ...'.'...24-67
Disposaf .................24'70
Cable Reel
Repfacement .........24'72
SRS Unh
Repfacement ..'......24'76
l-l
-+
sRs
Supplemental Restraint System (SRSI
Speciaf Tools ... ...........24'2
Component/Wirin g Locations
fndex ................ ......24-3
Description ................ 24-5
Circuit Diagram ......." 24'6
Precautions/Procedures
Generaf Precautions ...............,,,,,,,.. 24-7
Airbag Handling and Storage .........24-7
SRS Unit Precautions ...................... 24-8
Inspection After Deployment ........' 24-8
Wiring Precautions ................... ....... 24'9
Backprobing Spring-loaded Lock
Connectors .......,24-9
Spring-loaded Lock Connectol ....,,. 24-10
Spring-loaded Lock Connector with
Built-in Short Contact ................. 24-10
Disconnecting the Airbag
Connector(sl .....' 24'11
Steering-related Precautions ...,.,.,,. 24'12

Description
)
The sRS is a safety device which, when used in coniunction with the seat belt, is designed to help protect the driver land
front passenger) in a frontal impact exceeding a certain set limit. The system consists of the sRS unit {including safing
sensor and impact sensor), the cable reel, the driver's airbag (and front passenger's airbag)
FRONT PASSENGEB'SAIRAAG
DRIVER'S AIRBAG
CABLE REEL
SRS UNtT
t
Operation
The main circuit in the SRS unit senses and judges the force of impact and, if necessary, ignites the inflator charge(s) lf
battery voltage is too low or power is disconnected due to the impact, the voltage regulator and the back-up power clrcult
resoectivelv will keep voltage at a constant level.
For the SRS to operate:
(1) The impact sensor must activate. and send electric signals to the mlcroprocessor'
(2) The microprocessor must compute the signals' and must send signals to the airbag inflator(s)'
{3) The inflator(s) must ignite and deploy the airbag(s)'
_"-_-l
Ir3B!#h i
!.. I
ffi,*
Self-diagnosis System
A self-diagnosis circuit is built into the SRS unit; when the ignition switch is turned ON (ll), the SRS indicator light comes
on and goes off after about six seconds if the system is operating normally
lf the liglt does not come on, or does not go off after six seconds, or if it comes on while driving, it indicates an abnormal-
ity in the system. The system must be inspected and repaired as soon as possible
For better serviceability, the memory will store the cause of the malfunctlon, and the data link circuit passes on the infor-
mation from the memory to the data link connector (DLC). This intormation can be read with the Honda PGM Tesler con-
nected to the DLC (16P).
l,
24-5