9B – 24ILIGHTING SYSTEMS
DAEWOO V–121 BL4
Backup Lamps Inoperative
Step Action Value(s) Yes No
1
1. Block the wheels.
2. Apply the parking brake.
3. Turn the ignition ON.
4. Put the transaxle in REVERSE.
5. Remove one of the backup lamps from its
socket.
6. Test the lamp socket positive terminal with a
voltmeter.
Is the voltage equal to the specified value?
11–14 v Go to Step 3 Go to Step 2
2 Repair the open circuit between fuse F7 and the
backup lamps.
Is the repair complete?
System OK
3 Connect an ohmmeter between ground and the neg-
ative terminal at the bulb socket.
Is the resistance equal to the specified value?
0 W Go to Step 4 Go to Step 5
4 Replace the faulty backup lamps.
Is the repair complete?
System OK
5
1. Install the backup lamps.
2. Disconnect the electrical connector at the re-
verse switch. (On automatic transaxle vehicles,
disconnect the neutral safety/backup switch).
3. Turn the ignition ON.
4. Put the transaxle in REVERSE.
5. Use a voltmeter to check the reverse switch
terminal 1. (On automatic transaxle vehicles,
test terminal B of the neutral safety/backup
switch).
Is the voltage equal to the specified value?
11–14 v Go to Step 7 Go to Step 6
6 Repair 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
7
1. Put the transaxle in REVERSE.
2. Use an ohmmeter to check the continuity be-
tween reverse switch terminal 1 and terminal 2
terminals B and F on the neutral safety/backup
switch in automatic transaxle vehicles).
Does the continuity between terminals 1 and 2 (ter-
minals D and F with A/T) equal the specified value?
0 W Go to Step 9 Go to Step 8
8 Replace the REVERSE switch (neutral safety/back-
up switch in automatic transaxle vehicles).
Is the repair complete?
System OK
9 Repair the ground circuit between the REVERSE
switch (neutral safety/backup switch if equipped
with A/T) and the backup lamps.
Is the repair complete?
System OK
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