ground DAEWOO LACETTI 2004 Service Repair Manual

LIGHTING SYSTEMS 9B – 19
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
121. Reinstall the headlamp relay.
2. Check the voltage at the light switch connector
terminal 2.
Does the voltage equal the specified value?11–14 vGo to Step 14Go to Step 13
13Repair the open circuit between headlamp relay ter-
minal 85 and the light switch connector terminal 2.
Is the repair complete?–System OK–
141. Disconnect the light switch connector.
2. Turn the headlamps to the low–beam position.
3. Use an ohmmeter to check the continuity be-
tween terminals 2 and 3 of light switch.
Does the ohmmeter indicate the specified value?
0 WGo to Step 16Go to Step 15
15Replace the light switch.
Is the repair complete?–System OK–
16Repair the open circuit between terminal 3 of light
switch connector and ground.
Is the repair complete?–System OK–
17Check the voltage at headlamp switch connector
terminal 6.
Does the voltage equal the specified value?11–14 vGo to Step 19Go to Step 18
18Repair the open circuit between headlamp switch
connector and terminal 87 of the headlamp relay.
Is the repair complete?–System OK–
191. Disconnect headlamp switch connector.
2. Turn the headlamps to the low–beam position.
3. Connect an ohmmeter between terminals 5
and 6 of headlamp switch connector. Observe
the reading on the ohmmeter.
4. Turn the headlamps to the high–beam position.
5. Connect an ohmmeter between terminals 4
and 6 of the headlamp switch. Observe the
reading on the ohmmeter.
Does the ohmmeter show the specified value for
both of the tests?
0 WGo to Step 20Go to Step 15
20Repair the open circuit between the headlamp
switch and fuses Ef20, Ef27 and Ef15.
Is the repair complete?–System OK–

9B – 20ILIGHTING SYSTEMS
DAEWOO V–121 BL4
HEADLAMP LEVELING
Headlamps Leveling System Does Not Work
StepActionValue(s)YesNo
1Check the headlamps.
Do the headlamps work?–Go to Step 3Go to Step 2
2Repair the headlamp system before completing this
diagnostic table.
Has the headlamp system been repaired?–Go to Step 3–
3Check fuses Ef20 and Ef27.
Is either of the fuses blown?–Go to Step 5Go to Step 4
41. Check for a short circuit and repair if neces-
sary.
2. Replace the blown fuse.
Is the repair complete?–System OK–
51. Turn the headlamps ON.
2. Check the voltage at fuses Ef20 and Ef27.
Is the specified voltage available at the fuses?11–14 vGo to Step 7Go to Step 6
6Repair the open circuit between the headlamp
switch and fuses Ef20 and Ef27.
Is the repair complete?–System OK–
71. Disconnect the electrical connectors at the
headlamp leveling motors.
2. Turn the headlamps ON.
3. Check the voltage at terminal 5 of the head-
lamps.
Is the specified voltage available at both headlamp
leveling motors?11–14 vGo to Step 9Go to Step 8
8Repair the open circuit between fuses Ef20 and Ef27
and the headlamps.
Is the repair complete?–System OK–
9With the headlamp leveling motors disconnected,
check the resistance between ground and terminal
6 of the headlamps.
Is the resistance equal to the specified value?
0 WGo to Step 11Go to Step 10
10Repair the ground circuit for the headlamps.
Is the repair complete?–System OK–
111. Turn the headlamps ON.
2. With the headlamps, check the voltage at ter-
minal 3 of the headlamp connector.
Is the voltage approximately equal the specified val-
ue?6.2–10.6 vGo to Step 16Go to Step 12
121. Disconnect the headlamp leveling switch.
2. Turn the headlamps ON.
3. Check the voltage at the connector 3 wire at
the headlamp leveling switch connector.
Is the voltage equal to the specified value?11–14 vGo to Step 14Go to Step 13
13Repair the open circuit between the headlamp relay
and the headlamp leveling switch.
Is the repair complete?–System OK–

9B – 22ILIGHTING SYSTEMS
DAEWOO V–121 BL4
DAYTIME RUNNING LAMPS
Diagnostic Aids
The daytime running lamp (DRL) system will not work if the
parking brake is applied. The system is designed to work
only when the engine is running and the parking brake isreleased. If the parking brake circuit is shorted to ground
or the switch stays closed when the engine is running, the
DRL system will not work.
Daytime Running Lamps (DRL) Do Not Turn ON
StepActionValue(s)YesNo
1Turn the headlamps ON with the headlamp switch.
Do the headlamps work?–Go to Step 3Go to Step 2
2Repair the regular headlamp system before com-
pleting this diagnostic table.
Does the DRL system work after the headlamps
have been repaired?–System OKGo to Step 3
3With the DRL module still disconnected, use an
ohmmeter to check the resistance between ground
and terminal 5 of the DRL module connector.
Is the resistance equal to the specified value?
0 WGo to Step 5Go to Step 4
4Repair the circuit between ground and terminal 5 of
the DRL module connector.
Is the repair complete?–System OK–
51. Release the parking brake.
2. Turn the ignition switch ON.
3. Observe the parking brake indicator lamp.
Is the parking brake indicator lamp ON?–Go to Step 6Go to Step 9
6Disconnect the electrical connector to the parking
brake lever switch.
Is the parking brake indicator lamp still ON?–Go to Step 7Go to Step 8
7Repair the short to ground in the parking brake cir-
cuit.
Is the repair complete?–System OK–
8Replace the parking brake lever switch.
Is the repair complete?–System OK–
91. Make sure the headlamps are turned OFF.
2. With the DRL module disconnected, turn the
ignition ON.
3. Check the voltage at terminal 6 of the DRL
module.
Is the voltage equal to the specified value?0 vGo to Step 11Go to Step 10
10Repair the open between fuse F4 and terminal 6 of
the DRL module.
Is the repair complete?–System OK–
11Replace the DRL module.
Is the repair complete?–System OK–

LIGHTING SYSTEMS 9B – 23
DAEWOO V–121 BL4
PARKING LAMPS AND TAILLAMPS
Parking Lamps and Taillamps Do Not Work
StepActionValue(s)YesNo
1Check the headlamps.
Do the headlamps work?–Go to Step 3Go to Step 2
2Repair the headlamps before continuing with this
chart.
After the headlamps have been repaired, are the
parking lamps and taillamps still inoperative?–Go to Step 3System OK
31. Turn the parking lamps on.
2. Use a voltmeter to check voltage at the bulb
socket positive terminal.
Does voltage at the bulb socket equal the specified
value?11–14 vGo to Step 4Go to Step 7
4Connect an ohmmeter between ground and the
lamp socket negative terminal.
Is the resistance equal to the specified value?
0 WGo to Step 6Go to Step 5
5Repair the ground circuit for the lamps.
Is the repair complete?–System OK–
6Replace the faulty bulbs.
Is the repair complete?–System OK–
7Check fuses Ef23 and Ef28.
Are any of the fuses blown?–Go to Step 8Go to Step 9
81. Check for a short circuit and repair it, if neces-
sary.
2. Replace the fuse.
Is the repair complete?–System OK–
91. Turn the headlamps on.
2. Check the voltage at fuses Ef23 (left–side illu-
mination lamp) and Ef28 (right–side illumination
lamp).
Does the voltage at the fuses equal the specified val-
ue?11–14 vGo to Step 10–
10Repair the open circuit between the fuses Ef23 and
Ef28 and the illumination lamps.
Is the repair complete?–System OK–

9B – 24ILIGHTING SYSTEMS
DAEWOO V–121 BL4
Stoplamps Do Not Work
Notice : When probing a bulb socket with a voltmeter or a test lamp, do not contact the side of the socket (ground) when
you are testing the positive contact at the bottom of the socket. If the voltage and the ground are both available at the bulb
socket, contacting both at the same time with a test probe will cause a blown fuse.
Step
ActionValue(s)YesNo
1Check fuse Ef13.
Is fuse Ef13 blown?–Go to Step 2Go to Step 3
21. Check for a short circuit and repair it, if neces-
sary.
2. Replace the fuse.
Is the repair complete?–System OK–
3Use a voltmeter to check the voltage at fuse Ef13.
Is the voltage at Ef13 equal to the specified value?11–14 vGo to Step 5Go to Step 4
4Repair the power supply circuit for fuse Ef13.
Is the repair complete?–System OK–
51. Press the brake pedal.
2. Check the positive terminals of the bulb sock-
ets with a test lamp.
Does the test lamp illuminate?–Go to Step 6Go to Step 8
6Connect an ohmmeter between ground and the sto-
plamp ground terminal.
Is the resistance equal to the specified value?0 WGo to Step 8Go to Step 7
7Repair the ground circuit.
Is the repair complete?–System OK–
81. Disconnect the wiring connector from the brake
switch.
2. Press the brake pedal.
3. Use an ohmmeter to check continuity between
terminals 2 and 4.
Is the resistance equal to the specified value?0 WGo to Step 10Go to Step 9
9Replace the brake switch.
Is the repair complete?–System OK–
101. Disconnect the brake switch electrical connec-
tor.
2. Check the voltage at terminal 2.
Does the voltmeter show the specified value?11–14 vGo to Step 12Go to Step 11
11Repair the open circuit between the fuse Ef13 and
the brake switch.
Is the repair complete?–System OK–
12Repair the open circuit between the brake switch
and the stoplamps.
Is the repair complete?–System OK–

LIGHTING SYSTEMS 9B – 25
DAEWOO V–121 BL4
Center High–Mounted Stoplamp (CHMSL) Does Not Work
StepActionValue(s)YesNo
1Check the stoplamps.
Do the stoplamps work?–Go to Step 3Go to Step 2
2Repair the stoplamps before completing this diag-
nostic table.
Does the CHMSL work after the stoplamps have
been repaired?–System OKGo to Step 3
31. Remove the CHMSL lamp bulb.
2. Visually and physically check the CHMSL lamp
bulb.
Is the lamp bulb defective?–Go to Step 4Go to Step 5
4Replace the CHMSL lamp bulb.
Is the repair complete?–System OK–
51. Disconnect the CHMSL connector.
2. Use an ohmmeter to measure the resistance
between ground and the BLK wire in the
CHMSL connector.
Is the resistance equal to the specified value?0 WGo to Step 7Go to Step 6
6Repair the open circuit between ground and the BLK
wire in the CHMSL connector.
Is the repair complete?–System OK–
7Repair the open circuit between the stoplamp switch
and the CHMSL.
Is the repair complete?–System OK–

9B – 26ILIGHTING SYSTEMS
DAEWOO V–121 BL4
Backup Lamps Inoperative
StepActionValue(s)YesNo
11. Block the wheels.
2. Apply the parking brake to prevent the vehicle
from moving.
3. Turn the ignition on.
4. Put the transaxle in reverse (R).
5. Remove one of the backup lamps from its
socket.
6. Test the lamp socket positive terminal with a
voltmeter.
Does the battery voltage available at the backup
lamp socket positive terminal equal the specified
value?11–14 vGo to Step 3Go to Step 2
2Repair the open circuit between fuse F20 and the
backup lamps.
Is the repair complete?–System OK–
3Connect an ohmmeter between ground and the neg-
ative terminal at the bulb socket.
Is the resistance equal to the specified value?0 WGo to Step 4Go to Step 5
4Replace the faulty backup lamps.
Is the repair complete?–System OK–
51. Reinstall the backup lamps.
2. Disconnect the electrical connector at the re-
verse switch. (On automatic transaxle (A/T)
vehicles, disconnect the neutral safety/backup
switch.)
3. Turn the ignition on.
4. Put the transaxle in R.
5. Use a voltmeter to check for the reverse switch
terminal 1. (On A/T vehicles, test terminal 7 of
the neutral safety/backup switch).
Does the battery voltage available at terminal 1 (or
terminal 7, if equipped with A/T) equal the specified
value?11–14 vGo to Step 7Go to Step 6
6Repair the open circuit between the backup lamps
and the, reverse switch (or the neutral safety/backup
switch if equipped with A/T).
Is the repair complete?–System OK–
71. Put the transaxle in R.
2. Use an ohmmeter to check the continuity be-
tween reverse switch terminal 1 and terminal 2
(terminals 7 and 8 on the neutral safety/backup
switch, if equipped with A/T).
Does the continuity between terminals 1 and 2 (ter-
minals 7 and 8, if equipped with A/T) equal the speci-
fied value?0 WGo to Step 9Go to Step 8

LIGHTING SYSTEMS 9B – 27
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
8Replace the reverse switch (neutral safety/backup
switch, if equipped with A/T).
Is the repair complete?–System OK–
9Repair the ground circuit between the reverse switch
(neutral safety/backup switch, if equipped with A/T)
and ground G401.
Is the repair complete?–System OK–

9B – 28ILIGHTING SYSTEMS
DAEWOO V–121 BL4
Turn Signal Lamps and Hazard Lamps Do Not Work
StepActionValue(s)YesNo
1Check fuses F3 and F14.
Is either fuse blown?–Go to Step 2Go to Step 3
21. Check for a short circuit and repair it, if neces-
sary.
2. Replace the fuse.
Is the repair complete?–System OK–
31. Turn the ignition ON.
2. Check the voltage at fuses F3 and F14.
Does the battery voltage available at both fuses F3
and F14 equal the specified value?11–14 vGo to Step 4Go to Step 7
41. Turn the hazard switch on.
2. Remove each of the inoperative lamps from its
socket.
3. Test each lamp socket positive terminal with a
voltmeter.
Does the battery voltage pulsing at the turn signal
hazard lamp socket positive terminal equal the spe-
cified value?11–14 vGo to Step 5Go to Step 9
5At each bulb socket, use an ohmmeter to check the
ground circuit.
Is the resistance equal to the specified value?
0 WGo to Step 6Go to Step 8
6Replace any faulty turn signal/hazard bulbs.
Is the repair complete?–System OK–
7Repair the power supply circuit to fuses.
Is the repair complete?–System OK–
8Repair the open ground wires.
Is the repair complete?–System OK–
91. Turn on the hazard lamp switch.
2. Test the blinker unit connector terminal 49a
with a voltmeter.
Does the battery voltage pulsing at the blinker unit
terminal 49a equal the specified value?11–14 vGo to Step 15Go to Step 10
101. Turn on the hazard lamp switch.
2. Test the blinker unit connector terminal 49 with
a voltmeter.
Does the battery voltage available at the blinker unit
terminal 49 equal the specified value?11–14 vGo to Step 11Go to Step 14
111. Disconnect the blinker unit from the connector.
2. Use an ohmmeter to check between ground
and the connector for terminal 31 of the blinker
unit.
Is the resistance equal to the specified value?
0 WGo to Step 13Go to Step 12
12Repair the blinker unit ground connection.
Is the repair complete?–System OK–
13Replace the faulty blinker unit.
Is the repair complete?–System OK–

LIGHTING SYSTEMS 9B – 31
DAEWOO V–121 BL4
INTERIOR COURTESY AND LUGGAGE COMPARTMENT
LAMPS
Interior Courtesy Lamp Inoperative
CAUTION : Always make sure there is an electrical
load (lamp bulb, etc.) in any circuit between battery
terminals. Do not make a short circuit between bat-
tery terminals with a jumper wire. Hazardous spark-
ing would result and could cause injury.
Test Description
The number(s) below refer to step(s) on the diagnostictable.
1. Bulb test. Clip one end of a jumper wire to the neg-
ative battery terminal. Clip the other end of the
jumper wire onto one end of the bulb. Take the free
end of the bulb (the end without the jumper at-
tached) and touch it to the positive battery terminal.
Step
ActionValue(s)YesNo
11. Remove the interior courtesy lamp bulb and
inspect the filament.
2. If the filament is not broken, test the bulb using
the vehicle’s battery and a jumper wire.
Does the bulb pass the visual and physical checks?–Go to Step 3Go to Step 2
2Replace the bulb.
Is the repair complete?–System OK–
31. Reinstall the interior courtesy lamp bulb.
2. Check fuse Ef19.
Is fuse Ef19 blown?–Go to Step 4Go to Step 5
41. Check for a short circuit and repair it, if neces-
sary.
2. Replace the fuse.
Is the repair complete?–System OK–
5Check fuse Ef19.
Does the voltage at fuse Ef19 equal the specified
value?11–14 vGo to Step 7Go to Step 6
6Repair the open power supply circuit for fuse Ef19.
Is the repair complete?–System OK–
71. Disconnect the interior courtesy lamp electrical
connector.
2. Check the voltage at connector terminal 1.
Does the voltage at connector terminal 1 equal the
value specified?11–14 vGo to Step 8Go to Step 9
8Repair the open circuit between fuse Ef19 and the
interior courtesy lamp terminal 1.
Is the repair complete?–System OK–
91. With the interior courtesy lamp disconnected,
turn it to the on position.
2. Use an ohmmeter to check the resistance be-
tween ground and terminal 2 of the interior
courtesy lamp connector (harness side).
Is the resistance equal to the specified value?0WGo to Step 10Go to Step 11
10Replace the interior courtesy lamp switch assembly.
Is the repair complete?–System OK–
11Repair the ground circuit for the interior courtesy
lamp.
Is the repair complete?–System OK–