Volvo 850. Manual - part 65



   2    



 Digital Timer (Parking Heater)         



 12 Volts (On);   





        



                                        



 0 Volts (Off)    







   3    



 Rheostat                               



 12 Volts (On);   





        



                                        



 0 Volts (Off)    







   5    



 Power Supply To Power Stage            



 Battery Voltage  







   6    



 Power Ground                           



 0 Volts          







   8    



 Damper Motor Position Sensors          



 5 Volts          







   9    



 Signal Ground                          



 0 Volts          







   10   



 Signal Ground                          



 0 Volts          







   12   



 Driver’s Side Temp. Sensor             



 About 2.5 Volts  





        



                                        



 At Room          





        



                                        



 Temperature      







   13   



 Passenger’s Side Temp. Sensor          



 About 2.5 Volts  





        



                                        



 At Room          





        



                                        



 Temperature      







   14   



 Outside Temperature Sensor             



 About 2.5 Volts  





        



                                        



 At Room          





        



                                        



 Temperature      







   17   



 Driver’s Side Damper Motor Position    



 About 0.5-5.0    





        



 Sensor                                 



 Volts            







   18   



 Passenger’s Side Damper Motor Position 



 About 0.5-5.0    





        



 Sensor                                 



 Volts            







   19   



 Floor/Defrost Damper Motor Position    



 About 0.5-5.0    





        



 Sensor                                 



 Volts            







   20   



 Ventilation Damper Motor Position      



 About 0.5-5.0    





        



 Sensor                                 



 Volts            







   21   



 Recirculation Damper Motor Position    



 About 0.5-5.0    





        



 Sensor                                 



 Volts            







   23   



 Engine Coolant Temperature             



 5 Volts (Square  





        



                                        



 Wave) Variable   





        



                                        



 Frequency        







   24   



 Vehicle Speed Signal                   



 12 Volts (Square 





        



                                        



 Wave) Variable   





        



                                        



 Frequency        







   25   



 A/C Relay Control Signal (From         



 0-2 Volts (On);  





        



 Ignition System)                       



 About 12 Volts   





        



                                        



 (Off)            







   27   



 Diagnostic Signal From Power Stage     



 3 Volts (Normal);





        



                                        



 4 Volts          





        



                                        



 (Overcurrent);   





        



                                        



 1 Volt (No       





        



                                        



 Signal)          







   28   



 Logic Signal                           



 Open (Left);     





        



                                        



 0 Volts (Right)  







   30   



 Signal To/From Diagnostic Unit         



 Battery Voltage  



































































 (1) - Pin assignments not listed are not used.                     





ECC CONTROL MODULE PIN ASSIGNMENTS CONNECTOR "B"









































































 (1)    



  Function/Description   



           Voltage Value         





Pin No. 



                         



                                 







   31   



 Driver’s Side Damper    



About 0.4 Volts (Off), Zero Volts





        



 Motor Positive          



Or Battery Voltage (On With      





        



 Control Signal          



Control)                         







   32   



 Driver’s Side Damper    



About 0.4 Volts (Off), Zero Volts





        



 Motor Negative Control  



Or Battery Voltage (On With      





        



 Signal                  



Control)                         







   33   



 Passenger Side Damper   



About 0.4 Volts (Off), Zero Volts





        



 Motor Positive Control  



Or Battery Voltage (On With      





        



 Signal                  



Control)                         







   34   



 Passenger Side Damper   



About 0.4 Volts (Off), Zero Volts





        



 Motor Negative Control  



Or Battery Voltage (On With      





        



 Signal                  



Control)                         







   35   



 Floor/Defrost Damper    



About 0.4 Volts (Off), Zero Volts





        



 Motor Positive Control  



Or Battery Voltage (On With      





        



 Signal                  



Control)                         







   36   



 Floor/Defrost Damper    



About 0.4 Volts (Off), Zero Volts





        



 Motor Negative Control  



Or Battery Voltage (On With      





        



 Signal                  



Control)                         







   37   



 Ventilation Damper      



About 0.4 Volts (Off), Zero Volts





        



 Motor Positive Control  



Or Battery Voltage (On With      





        



 Signal                  



Control)                         







   38   



 Ventilation Damper      



About 0.4 Volts (Off), Zero Volts





        



 Motor Negative Control  



Or Battery Voltage (On With      





        



 Signal                  



Control)                         







   39   



 Recirculation Damper    



About 0.4 Volts (Off), Zero Volts





        



 Motor Positive Control  



Or Battery Voltage (On With      





        



 Signal                  



Control)                         







   40   



 Recirculation Damper    



About 0.4 Volts (Off), Zero Volts





        



 Motor Negative Control  



Or Battery Voltage (On With      





        



 Signal                  



Control)                         







   41   



 Control Signal To A/C   



About 0 Volts Or Battery Voltage 





        



 Relay                   



                                 







   42   



 Control Signal To Power 



12 Volts (Square Wave) Constant  





        



 Stage                   



Frequency With Varying Duty Cycle







   45   



 Driver’s Side Passenger 



0 Volts Or Battery Voltage Temp. 





        



 Compartment             



Sensor Intake Fan Control Signal 







   46   



 Passenger’s Side        



0 Volts Or Battery Voltage Temp. 





        



 Passenger Compartment   



Sensor Intake Fan Control Signal 



































































 (1) - Pin assignments not listed are not used.                     





ECC CONTROL MODULE PIN ASSIGNMENTS CONNECTOR "C"









































































 (1)    



  Function/Description        



        Voltage Value       





Pin No. 



                              



                            







   47   



 Driver’s Side Duct Temp.     



 About 2.5 Volts At Room    





        



 Sensor Signal                



 Temperature                







   48   



 Passenger’s Side Duct Temp.  



 About 2.5 Volts At Room    





        



 Sensor Signal                



 Temperature                







   51   



 Signal From Solar Sensor     



 2-40 Millivolts            







   56   



 Signal Ground                



 0 Volts                    



































































 (1) - Pin assignments not listed are not used.                     





         SOLAR SENSOR

         1) Connect test unit to ECC control module. Check ground

circuits. See DTC 1-2-1, OUTSIDE TEMP. SENSOR CIRCUIT SHORTED TO

GROUND. If ground circuits are okay, go to next step.

         2) Turn ignition on. Aim a light source at solar sensor.

Connect voltmeter between test unit pins No. 51 and 56 and record

voltage. Cover solar sensor and read voltage again. See  Fig. 16.

Voltage should vary by a few millivolts. The higher the intensity, the

lower the voltage. If sensor does not operate as specified, there is

an open circuit or short to ground in wire or solar sensor.

Fig. 16:  Locating ECC System Sensors

Courtesy of Volvo Cars of North America.

         SPEEDOMETER SIGNAL

         1) Raise and support front of vehicle. Perform  TEST MODE 2

under TROUBLE SHOOTING. ECC control module should respond to vehicle

speed signal with Code 1-1-3. ECC control module will continue to

flash code even once TEST MODE 2 is activated. If Code 1-1-3 does not

appear, turn ignition off. Cover solar sensor. Turn ignition on. Start

TEST MODE 2. Let car wheels turn freely. Open throttle.

         2) If no acknowledgment code appears after several attempts,

there may be a problem with vehicle speed signal impulse sensor in

ignition system, instrument panel, or wiring.

         3) Check if speedometer operates. If speedometer does not

operate, a fault may be present in vehicle speed signal impulse

sensor, ignition system, instrument cluster, or wiring. If speedometer

does operate, check for open circuit in instrument cluster wiring.

         REMOVAL & INSTALLATION

WARNING: To avoid injury from accidental air bag deployment, read and

         carefully follow all SERVICE PRECAUTIONS and DISABLING &

         ACTIVATING AIR BAG SYSTEM procedures in the AIR BAG RESTRAINT

         SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT section.

         A/C RELAY & POWER STAGE

         Removal & Installation

         Turn ignition off. The A/C relay and power stage are located

on A/C climate control unit, behind glove compartment. Remove glove

compartment. Remove A/C relay. Disconnect connector from power stage.

Hold catches in and pull connector straight out from power stage. See

Fig. 15. To install, reverse removal procedure.

         CLIMATE CONTROL UNIT

         Removal & Installation

         1) Disconnect negative battery cable. Remove dashboard

assembly. See DASHBOARD. Discharge A/C system, using approved

refrigerant recovery/recycling equipment. Disconnect evaporator inlet

and outlet pipes, and cap both ends. Remove evaporator cover plate and

gasket from firewall. See Fig. 17.

         2) Disconnect heater hose quick-disconnect couplings. Remove

heater hose cover plate and gasket from firewall. Inside vehicle,

disconnect A/C-heater control cables and all electrical connectors

from climate control unit. Remove relay shelf. See  Fig. 15.

         3) Remove tunnel console. Remove kick panels next to tunnel.

Remove rear floor ducts connection hose. Remove radio amplifier

bracket. Disconnect cruise control vacuum cylinder, if equipped.

Remove climate control unit. To install, reverse removal procedure.

Lubricate NEW "O" rings with compressor oil. Evacuate and charge

system.