7A – 8IHEATING AND VENTILATION SYSTEM
DAEWOO V–121 BL4
Step NoYesValue(s)Action
7
1. Turn the ignition ON.
2. Turn the blower motor switch to 4.
3. Check the blower motor ground.
Is ground OK?
Go to Step 9 Go to Step 8
8 Repair the blower motor ground.
Is the repair complete?
System OK
9 Check the motor connector with a 12–volt test light.
Does the test light come on?
Go to Step 10 Go to Step 11
10 Repair the open in the feed wire from the resistor
block to the blower motor.
Is the repair complete?
System OK
11 Use the 12–volt test light to check the power feed
terminal on the blower speed switch.
Does the light come on?
Go to Step 12 Go to Step 13
12 Replace the blower speed switch.
Is the repair complete?
System OK
13 Repair the open in the power wire from the blower
speed switch to the fuse panel.
Is the repair complete?
System OK
14 Does the blower fail to operate at speed 4? Go to Step 15 Go to Step 21
15 Check fuse EF2 in the engine fuse block.
Is the fuse blown?
Go to Step 16 Go to Step 17
16
1. Turn the ignition ON.
2. Turn the blower motor switch to 4.
3. Use a short detector to locate the following
possible shorts:
S From the engine fuse panel to the blower
HI relay.
S From the blower HI relay to the blower mo-
tor.
4. Repair any short.
5. Replace the EF2.
Is the repair complete?
System OK
17
1. Turn the ignition ON.
2. Turn the blower motor switch to 4.
3. Check for 12 volts on the blower HI relay coil
terminal from the blower speed switch terminal
A2.
Is this voltage present?
Go to Step 18 Go to Step 19
18 Replace the blower speed switch.
Is the repair complete?
System OK
19
1. Turn the ignition OFF.
2. Check for opens in the following locations:
S Fuse EF2 to the blower HI relay.
S Blower speed switch to the blower HI relay.
S Blower HI relay to ground.
S Blower HI relay to the blower motor.
3. Repair any opens.
Is the repair complete?
System OK Go to Step 20
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