Page 2249 of 2643

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–
Page 2250 of 2643

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–
Page 2251 of 2643
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–
Page 2252 of 2643

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
Page 2253 of 2643
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–
Page 2254 of 2643

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–
Page 2255 of 2643

LIGHTING SYSTEMS 9B – 29
DAEWOO V–121 BL4
StepNo Yes Value(s) Action
141. Disconnect the hazard lamp switch connector.
2. Check for voltage at terminal 8.
3. Turn the ignition ON.
4. Check for voltage at terminal 10.
Does the battery voltage available at both terminals
equal the specified value?11–14 vGo to Step 15Go to Step 20
151. Remove the hazard lamp switch.
2. Turn the hazard lamp switch off.
3. Check for continuity between terminals 7 and
10.
4. Turn the hazard lamp switch on.
5. Check for continuity between terminals 7 and
8.
Do both tests show the specified value?0 WGo to Step 18Go to Step 17
161. Remove the hazard lamp switch.
2. Turn the hazard lamp switch on.
3. Use an ohmmeter to check for continuity be-
tween terminals 5, 6, and 9.
Does the continuity between terminals 5, 6, and 9
equal the specified value?0 WGo to Step 19Go to Step 17
17Replace the faulty hazard lamp switch.
Is the repair complete?–System OK–
18Repair the open circuit between the hazard lamp
switch terminal 7 and the blinker unit terminal 49.
Is the repair complete?–System OK–
19Repair the open circuit between the hazard lamp
switch and the fuses F3 or F14.
Is the repair complete?–System OK–
Page 2256 of 2643

9B – 30ILIGHTING SYSTEMS
DAEWOO V–121 BL4
Hazard Lamps Do Not Operate, Turn Signals Are OK
StepActionValue(s)YesNo
1Check fuse F14.
Is fuse F14 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 for power to fuse F14.
Does the battery voltage available at fuse F14 equal
the value specified?11–14 vGo to Step 5Go to Step 4
4Repair the power supply circuit to fuse F14.
Is the repair complete?–System OK–
51. Disconnect the hazard switch connector.
2. Use a voltmeter to check power to the hazard
switch terminal 8.
Does the battery voltage available at connector ter-
minal 8 equal the value specified?11–14 vGo to Step 6Go to Step 9
61. Remove the hazard switch and disconnect it
for testing.
2. Turn the hazard switch on.
3. Test with an ohmmeter between terminals 7
and 8.
Is the resistance equal to the specified value?0 WGo to Step 7Go to Step 10
71. With the hazard switch still removed and dis-
connected for testing, turn the hazard switch
on.
2. Use an ohmmeter to check between terminals
5, 6, and 9.
Is the resistance equal to the specified value?0 WGo to Step 8Go to Step 10
8Repair the open circuit between the hazard lamp
switch connector and splice S202.
Is the repair complete?–System OK–
9Repair the open circuit between the hazard switch
connector terminal 8 and fuse F14.
Is the repair complete?–System OK–
10Replace the faulty hazard switch.
Is the repair complete?–System OK–