Mazda 1996 626, Service Manual

Page: 257 / 533

HEATER AND REFRIGERANT SYSTEM
G
Inspection
1. Remove the switch panel.
(Refer to the 1996 626/MX-6 Workshop Manual, section S.)
2. Measure the voltage at each terminal of the heater con­
trol unit connectors and fan switch connector.
3. If the measurement voltage is incorrect, check the relat­
ed components and wiring harnesses. If the related
components and wiring harness are OK, replace the
heater control unit.
B+; Battery positive voltage
Connector Terminal Wire
Connection
Test condition Voltage (V)
1A (G/W) Air mix actuator Any Approx. 6
1B (BR) Any 0
1C (P) Temperature lever moved from hot to cold
(Air mix actuator operating at MAX COLD)
B+
1D (G) Temperature lever in hot position 5
Temperature lever in cold position
Approx. 1
Connector
A
(10 pin)
1F (G/Y)
Temperature lever moved from cold to hot
(Air mix actuator operating at MAX HOT)
B+
1H (Y/B) Airflow mode actuator VENT switch on (only while airflow mode
actuator is operating from DEF to VENT) B+
11 (Y/G) DEF switch on (only while airflow mode
actuator is operating from VENT to DEF)
B+
1J (B) GND Any 0
1K — — —
_ _
1L
(L)
Ignition switch Ignition switch at ON B+
2A
(W)
Airflow mode actuator DEF switch on (only while airflow mode
actuator is operating from VENT to DEF)
0
2B (G/Y) Panel light control switch Light switch on and panel light control
switch at maximum illumination 0
Light switch on and panel light control
switch at minimum illumination Approx. 10
2C (W/B) Airflow mode actuator VENT switch on (only while airflow mode
actuator is operating from DEF to VENT) B+
2D
(0)
TNS relay Light switch on B+
Connector
B
2E (R) A/C amplifier Fan switch off B+
2F
(L/W)
A/C switch and fan switch on 0
(14 pin)
2H (G/L) Air intake actuator
FRESH switch on* B+
2J
(L)
_
REC switch on* B+
2K (Y/W) Airflow mode actuator DEF switch on 0
2L (Y) HEAT/DEF switch on 0
2M (W/L) HEAT switch on 0
2N (W/Y)
VENT switch on
0
2 0
(W/G) BI-LEVEL switch on
0
2P
(B/R) Swing louver Ignition switch at ON
B+
Swing switch on Approx. 1
* It will take a while to get the normal voltage.
20 2M2K
X
2E 2C 2A 1 K 11
X
1C 1A
2P 2N 2L 2J 2H 2F 2D 2B
1L 1J 1H 1F 1D 1B
E C A
F D B
Terminal voltage list
G -4 3