Chart 4 - Improper Blower Speed (Cont.)

CHART 4 IMPROPER BLOWER SPEED (CONTINUED)

ECC SYSTEM CHECK MUST BE PERFORMED FIRST

CIRCUIT DESCRIPTION
Based on a signal sent from the BCM, the programmer sends a variable amperage signal to the power module which is then amplified and sent to the blower motor. The programmer monitors the blower voltage so that the signal can be adjusted to achieve the desired blower motor speed.

Test Description: Numbers below refer to circled numbers on the diagnostic chart.
1. This step checks the commanded blower speed input to the programmer.
2. This step checks for a short to voltage on CKT 760.
3. This step checks the blower speed control input to the power module.
4. This step checks actual blower voltage.
5. This step checks blower motor voltage feed back to the programmer.