
AC–48
AIR CONDITIONING SYSTEM – TROUBLESHOOTING
Blinking Light LO HI Air Outlet Damper Position Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects the position of the air mix
damper and sends the appropriate signals to the
A/C amplifier.
The position sensor is built into the air outlet
damper control servo motor assembly.
(V)
4
TPM terminal
voltage
1
0 100%
Damper opening angle AC2184
Light Diagnostic Sensor Check Detecting Condition Trouble Area
LO Short to ground or power source circuit in air
outlet damper position sensor circuit.
• Air outlet damper position sensor
• Harness or connector between air outlet
damper control servo motor assembly and
A/C amplifier
• A/C amplifier
HI Air outlet damper position sensor value does
not change even if A/C amplifier signals the air
outlet damper control servo motor to move.
WIRING DIAGRAM
Air Outlet Damper
Position Sensor
Air Outlet Damper
Control Servo Motor
4 BR-W 5 BR-W 2 S5 5 V
IG 1 A13
3 LG 6 LG 10 TPM
IG 1 A14
5 V-W 4 V-W 9 SG
IG 1 A13
A/C Amplifier
N08817