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Home >> Volvo >> 1996 >> 850 Turbo L5-2.3L Turbo VIN 57 B5234FT >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Component Tests and General Diagnostics >> Test Modes >> Test Mode 4

Test Mode 4



Test Mode 4


General

Test mode 4 is used to:

- Control A/C relay output (compressor ON/OFF).

Note! This function has been deleted with the effect from chassis Nos. 854-109023 and 855-019949

- Self-adjustment of damper motor limit positions
- Change the transmission speed from the control unit to the diagnostic unit

Note! The control unit controls must be in the right setting for giving the control code concerned.






Settings for checking A/C relay output

- Start engine
- Set fan setting on control unit to a manual position (i.e. not AUTO or 0)
- Air distributor switch to AUTO

Settings for adjustment of damper motors

- Fan control in manual at about mid setting
- Recirculation ON
- Left-hand temperature control set to MAX cooling (blue mark)
- Right-hand side temperature control set to MAX heating (red mark)
- Air control set to point between Ventilation and Defroster
- A/C switch may be set either to ON/AUTO or OFF (the setting does not affect calibration)

Activation






- Ignition on.
- Press button four times (about 1 second each time).

The LED lights up once test mode 4 is activated. The control unit can now receive a control code.

Entering codes

Codes must be entered one step at a time, while watching the LED. The LED will go off after each digit has been entered. It will then light up again for the next digit to be entered.

Entering each digit in the code must not take more than 4 seconds. Failure to do so within four seconds means that the control unit will be unable to accept that digit. You will have to abort the input.

- Switch ignition off and on. Restart test mode 4.

Example: to enter code 3-1-2:

Unit must be in test mode 4 (LED on).

- Press button three times. The LED will go out. Wait until it comes on again.
- When the LED comes on, enter the next digit.
- Press button once. The LED will go out. Wait until it comes on again.
- When the LED comes on, press button twice.

* Code 3-1-2 is now entered.

Exiting

To exit test mode 4:

Switch ignition off to abort test mode 4 once all checks have been made.

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