TEST 2: Testing The M1 Blower Speed Circuit
In this test section, we're gonna' test the medium 1 (M1) blower speed circuit inside the blower motor switch.
This test follows the same procedure as that of TEST 1 but we're gonna' now probe female terminal #1 of the blower resistor assembly's connector with the 12 Volt test light.
Female terminal #1 should have a light green (LT GRN) wire connected to it.
These are the test steps:
- 1
Disconnect the blower resistor from its electrical connector.
NOTE: This and all the other tests are done with your 3.9L V6 Dodge Dakota's ignition key in its OFF position. - 2
Select blower motor speed M1 on the AC/Heater Control Panel.
- 3
Connect the 12 Volt test light's alligator clip to the positive (+) battery terminal of your Dodge Dakota's battery.
- 4
Probe the female terminal identified with the #1, of the blower resistor assembly's connector, with the metallic point of your 12 Volt test light.
Female terminal #1 has a light green (LT GRN) wire connecting to it. - 5
The 12 Volt test light should come on if the M1 circuit is OK.
Let's examine your test result:
CASE 1: The 12 Volt test light turned on. This is the correct test result. You can conclude that the blower motor switch's M1 circuit is working correctly.
The next test is to check that the M2 speed circuit on your 3.9L V6 Dodge Dakota. For this test go to: TEST 3: Testing The M2 Blower Speed Circuit.
CASE 2: The 12 Volt test light DID NOT turn on. This test result lets you know that the blower motor switch is defective and needs to be replaced.
TEST 3: Testing The M2 Blower Speed Circuit
So far you have:
- Tested the blower motor switch's LO speed circuit (TEST 1).
- Tested the blower motor switch's M1 speed circuit (TEST 2).
We're gonna' now test the medium 2 (M2) speed circuit of the blower motor switch. The terminal that we're gonna' probe with our 12 Volt test light is female terminal #2 of the blower resistor assembly's connector.
Female terminal #2 should have a light blue (LT BLU) wire connected to it.
These are the test steps:
- 1
Disconnect the blower resistor from its electrical connector.
NOTE: This and all the other tests are done with your 3.9L V6 Dodge Dakota's ignition key in its OFF position. - 2
Select blower motor speed M2 on the AC/Heater Control Panel.
- 3
Connect the 12 Volt test light's alligator clip to the positive (+) battery terminal of your Dodge Dakota's battery.
- 4
Probe the female terminal identified with the #2, of the blower resistor assembly's connector, with the metallic point of your 12 Volt test light.
Female terminal #2 has a light blue (LT BLU) wire connecting to it. - 5
The 12 Volt test light should come on if the M2 circuit is OK.
Let's examine your test result:
CASE 1: The 12 Volt test light turned on. This is the correct test result.
Our last test is to make sure the HI speed circuit is OK. For this test go to: TEST 4: Testing The HI Blower Speed Circuit.
CASE 2: The 12 Volt test light DID NOT turn on. This test result lets you know that the blower motor switch is defective and needs to be replaced.
