2003 HONDA CIVIC Ignition switch

11.
12.
14.
Disconnect SRS unit connector B (18P) from the
SRS unit (see step 7 on page 23-22).
Disconnect the special tool from the floor wire
harness.
Reconnect the battery negative cable.
Turn the ignition switch ON (ll).
Check for voltage between the No. 1 lerminal of
SRS unit connector B {18P) and body ground, and
the No. 10 terminal and body ground. There should
be 0.5 V or less.
SRS UNIT CONNECTOR B I18PI
ls the voltage as specitied?
YES Faulty SRS unit; replace the SRS unit (see
page 23-1221 .f
NO Short to power in the floor wire harness;
replace the floor wire harness.l
I
fJ
4.
DTC 21-5: Short to Ground in Driver's Seat
Belt Buckle Tensioner
Special Tools Required. SRS inflator simulator 07SAZ-TB4011A. SRS simulator lead F 07XAZ-S230100
1. Erase the DTC memory {see page 23-26}.
2. Turn the ignition switch ON (ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SBS indicator stay on?
YES-Go to step 3.
NO Intermittent failure, system is OK at this time.
Go to Troubleshooting Intermittent Failures (see
page 23-26).
Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
Disconnect the driver's seat belt buckle tensioner
4P connector {A) from the floor wire harness.
Connect the SRS inflator simulator (2 Q
connectors) and simulator lead F to the floor wire
n a rness.
Reconnect the battery negative cable.
Erase the DTC memory.
(cont'd)
6.
7.
23-57

sRs
9.
10.
DTC Troubleshooting (cont'dl
11.
Read the DTC.
ls DTC 21-5 indicated?
YES Go to step 9.
NO Short to ground in the driver's seat belt
buckle tensioner; replace the driver's seat belt
buckle.l
Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
Disconnect both side airbag 2P connectors (see
step 4 on page 23-21)and the front passenger's
seat belt buckle tensioner 4P connector (see step 6
on page 23-221.
Disconnect SRS unit connector B (18P) from the
SRS unit (see step 7 on page 23-22)
Disconnect the special tool from the floor wire
harness.
Check resistance between the No. '1 terminal of
SRS unit connector B (18P) and body ground, and
the No. 10 terminal and body ground. There should
be an open circuit, or at least 1 M Q.
12.
13.
SRS UNIT CONNECTOR B {18PI
ls the tesistance as specilied?
YES Faulty SRS uniu replace the SRS unit (see
page 23-122) .a
NO-Short to ground in the floor wire harness;
replace the floor wire harness.l
23-58
\J
'L
DTC 4-1: Open in Front Passenger's Seat Belt
renstoner
DTC 4-2: lncreased Resistance in Front
Passenger's Seat Belt Tensioner
Special Tools Required. SRS inflator simulator 07SM-T84011A. SRS simulator lead C 07TAZ-S25011A. SRS simulator lead F 07XAZ-S230100
Erase the DTC memory (see page 23-26).
Turn the ignition switch ON {ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SBS indicator stay on?
YES-Go to step 3.
NO- Intermittent failure, system is OK at this time.
Go to Troubleshooting Intermittent Failures {seepage 23-26).
Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
Disconnect the front passenger's seat belt
tensioner 2P connector (A) from the floor wire
harness.
07TAZ-525011A
5. Connect the SRS inflator simulator (2 0 connector)
and simulator lead C to the floor wire harness.

)
)
6. Reconnect the battery negative cable.
7. Erase the DTC memory.
8. Read the DTC.
ls DTC 4-1 or DTC 4-2 indicated?
YES Go to step 9.
NO-Open or increased resistance in the frontpassenger's seat belt tensioner; replace the frontpassenger's seat belt (see page 23-4). t
L Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
10, Disconnect the floor wire harness 4P connector
C403 (A)from dashboard wire harness B.
07sAz-T840't 1A
Connect the SRS inflator simulator (2 i)
connectors) and simulator lead F to dashboard wire
harness B.
Reconnect the battery negative cable.
Erase the DTC memory.
Read the DTC.
ls DTC 4-l or DTC 4-2 indicated?
YES-Go to step '15.
NO-Open or increased resistance in the floor wire
harness; replace the floor wire harness.I
11.
12.
14.
I
15. Turn the ignition switch OFF. Disconnect the
battery negative cable. and wait for 3 minutes.
'16. Disconnect the driver's airbag connector {see step
2 on page 23-211, tront passenger's airbag
connector (see step 3 on page 23-21), and driver's
seat belt tensioner connector (see step 5 on page
23-221.
17. Disconnect SRS unit connector A (18P) from the
SRS unit (see step 7 on page 23-22). Do not
disconnect the special tool from dashboard wire
harness B.
18. Check resistance between the No. 9 terminal and
the No. '18 terminal of SRS unit connector A (18P).
There should be 2.0-3.0 Q.
SRS UNIT CONNECTOR A {18P}
Wire side of lemale terminals
ls the resistance as specitied?
YES Faulty SRS unit or poor contact at SRS unit
connector A (18P) and the SRS unit. Check the
connection; if the connection is OK, replace the
SRS unit (see page 23-122l,.a
NO-Open or increased resistance in dashboard
wire harness B; replace dashboard wire harness
B.T
RED/YEL
{ll6r8l
rl
1234578
1011121517
RED/BLK
23-59

sRs
DTC Troubleshooting (cont'dl
DTC 4-3: Short to Another Wire or Decreased
Resistance in Front Passenger's Seat Belt
Tensioner
Special Tools Required. SRS inflator simulator 07SAZ-TB40l1A. SRS simulator lead C 07TM-S25011A. SRS simulator lead F 07XAZ-S230100
1. Erasethe DTC memory (see page 23-26).
2. Turn the ignition switch ON (ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SRS indicator stay on?
YES-Go to step 3.
NO Intermittent failure. system is OK at this time.
Go to Troubleshooting lntermittent Failures (see
page 23-26).
3. Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
4. Disconnect the front passenger's seat belt
tensioner 2P connector (A) from the floor wire
narness.
07TAZ-S25011A
Connect the SRS inflator simulator (2 Q connector)
and simulator lead C to the floor wire harness.
Reconnect the battery negative cable.
Erase the DTC memory.
6.
7.
23-60
15.
\J
8. Read the DTC.
ls DTC 4-3 indicated?
YES-Go to step L
NO-Short in the front passenger's seat belt
tensioner; replace the front passenger's seat belt
(see page 23-4).1
9. Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
'10. Disconnect the floor wire harness 4P connector
C403 {A)from dashboard wire harness B.
TB40,I1A
L
11.Connect the SRS inflator simulator (2 0
connectors) and simulator lead F to dashboard wire
harness B.
Reconnect the battery negative cable.
Erase the DTC memory.
Read the DTC.
ls DTC 4-3 indicated?
YES-Go to step 15.
NO Short jn the floor wire harness; replace the
floor wire harness.I
Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
13.
14.

I
]
16. Disconnectthe driver's airbag connector (see step2 on page 23-211, front passenger's airbagconnector (see step 3 on page 23-21), and driver,sseat belt tensioner connector (see step 5 on page
23-221.
17. Disconnect SRS unit connector A (18p) from the
SRS unit (see step 7 on page 23-22).
18. Disconnect the special tool from dashboard wireharness B.
19. Check resistance between the No. 9 terminal andthe No. 18 terminal of SRS unit connector A (18p).
There should be an open circuit, or at least 1 Me.
SRS UNIT CONNECTOR A I18P}
Wire side of female terminals
ls the resistance as specified?
YES-Faulty SRS unit; replace the SRS unit (see
page 23-1221 .f
NO-Short in dashboard wire harness B; replace
dashboard wire harness B. I
RED/YEL
I]
t6r8 l \P
T
234568
10tl12t3151617
RED/BLK
DTC 4-4: Short to Power in Front Passenger's
Seat Belt Tensioner
Special Tools Required. SRS inflator simulator 07SAZ-T84011A. SRS simulator lead C 07TAZ-S25011A. SRS simulator lead F 07XAZ-S230100
1. Erase the DTC memory (see page 23-26).
2. Turn the ignition switch ON {ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SRS indicator stay on?
YES Go to step 3.
NO- Intermiftent failure. system is OK at this time.Go to Troubleshooting Intermittent Failures (see
page 23-261.
3. Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
4. Disconnectthe front passenger's seat belttensioner 2P connector (A) from the floor wire
harness.
07TAZ-S2501'lA
5. Connect the SRS inflator simulator (2 e connector)and simulator lead C to the floor wire harness.
{cont'd)
23-61

sRs
DTC Troubleshooting (cont'd)
6. Reconnect the battery negative cable.
7. Erase the DTC memory.
8. Read the DTC.
ls DTC 4-4 indicated?
YES Go to step 9.
NO-Short to power in the front passenger's seat
belt tensioner; replace the front passenger's seat
belt (see page 23-4).I
9. Turn the ignition switch OFF. Disconnect the
battery negative cable. and wait for 3 minutes.
'10. Disconnect floor wire harness 4P connector
C403 (A)from dashboard wire harness B.
07sAz-TB4o11A
Connect the SRS inflator simulator (2 0
connectors) and simulator lead F to dashboard wire
harness B.
Reconnect the battery negative cable.
Erase the DTC memory.
Read the DTC.
ls DTC 4-4 indicated?
YES-Go to step 15.
NO- Short to power in the floor wire harness;
replace the floor wire harness.l
11.
tJ.
14.
23-62
11.
15.
to.
18.
19.
20.
21.
Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
Disconnect the driver's airbag connector (see step
2 on page 23-211, tront passenger's airbag
connector (see step 3 on page 23-21), and drivefs
seat belt tensioner connector (see step 5 on page
23-22t.
Disconnect SRS unit connector A ('l8P) trom the
SRS unit (see step 7 on page 23-22).
Disconnect the special tool from dashboard wire
harness B.
Reconnect the battery negative cable.
Turn the ignition switch ON (ll).
Check for voltage between the No. 9 terminal of
SRS unit connector A (18P) and body ground, and
the No. 18 terminal and body ground. There should
be 0.5 V or less.
SRS UNIT CONNECTOR A (18PI
Wire side oJ Jemale terminals
Is the voltage as specified?
YES Faulty SRS unit; replace the SRS unit (see
page 23'1221.a
NO Shortto power in dashboard wire harness B;
replace dashboard wire harness B.l
t'J
J

I
I
DTC 4-5: Short to Ground in Front Passenger's
Seat Belt Tensioner
Special Tools Required. SRS inflator simulator 07SAZ-TB40'11A. SRS simulator lead C 07TAZ-S25011A. SRS simulator lead F 07XAZ-S230100
1. Erasethe DTC memory (see page 23-26]|.
2. Turn the ignition switch ON (ll), and checkthatthe
SRS indicator comes on for about 6 seconds andthen goes off.
Does the SRS indicator stay on?
YES-Go to srep 3.
NO-lntermittent failure, system is OK at this time.Go to Troubleshooting Intermittent Failures (see
page 23-26l,.
3. Turn the ignition switch OFF. Disconnect thebattery negative cable, and wait for 3 minutes.
4. Disconnect the front passenger's seat belttensioner 2P connector (A) from the floor wire
harness.
07TAZ-SZ501rA
Connect the SRS inflator simulator (2 e connector)and simulator lead C to the floor wire harness.
Reconnect the battery negative cable.
Erase the DTC memory.7.
8. Read the DTC.
ls DTC 4-5 indicated ?
YES-Go to step 9.
NO Short to ground in the front passenger's seat
belt tensioner; replace the front passenger's seat
belt (see page 23-4).I
9. Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
10. Disconnect the floor wire harness 4P connector
C403 (Alfrom dashboard wire harness B.
TB40 t 1A
Connect lhe SRS inflator simulator (2 econnectors) and simulator lead F to dashboard wire
harness B.
Reconnect the battery negative cable.
Erase the DTC memory.
Read the DTC.
ls DTC 4-5 ind icated?
YES Go to step 15.
NO-Short to ground in the floor wire harness;
replace the floor wire ha rness.l
Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
11.
12.
14.
(cont'd)
23-63

sRs
DTC Troubleshooting (cont'dl
16. Disconnect the driver's airbag connector (see step
2 on page 23-21), front passenger's airbag
connector (see step 3 on page 23-21). and driver's
seat belt tensioner connector (see step 5 on page
23-22).
17. Disconnect SRS unit connector A (18P)from the
SRS unit (see step 7 on page 23-221.
18. Disconnect the specialtool from dashboard wire
harness B.
19. Check resistance between the No.9 terminal of
SRS unit connector A (18P) and body ground, and
the No. l8 terminal and body ground. There should
be an open circuit. or at least 1 M Q.
SRS UNIT CONNECTOR A {18P)
wire side of lemale terminals
ls the rcsistance as specified?
YES Faulty SRS uniU replace the SRS unit (see
page 23-1221.1
NO-Short to ground in dashboard wire harness B;
replace dashboard wire harness B.I
23-64
DTC 22-1: Open or Increased Resistance in
Front Passenger's Seat Belt Buckle Tensioner
Special Tools Required. SRS inflator simulator 07SAZ-T84011A. SRS simulator lead F 07XAZ-S230100
1 . Erase the DTC memory (see page 23-261.
2. Turn the ignition switch ON (ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes otf.
Does the SRS indicator stay on?
YES-Go to step 3.
NO-lntermittent failure, system is OK at this time.
Go to Troubleshooting Intermittent Failures (see
page 23-26).
3. Turn the ignition switch oFF. Disconnect the
battery negative cable, and wait for 3 minutes.
4. Disconnectthe front passenger's seat belt buckle
tensioner 4P connector (A) from the floor wire
harness.
5. Connect the SRS inflator simulator (2 Q
connectors) and the simulator lead F to the floor
wtre harness.
\,