Ford Falcon. Manual - part 327

412-04-21 Control 

Components 412-04-21

DIAGNOSIS AND TESTING (Continued)

NOTE: Very minor bleed of air from Floor outlets is

acceptable.

PINPOINT TEST G : ACTUATOR — DRIVER AIR TEMPERATUR MIX. (ACC)

 CAUTION: Use extreme care when probing the harness terminals. Forcing the Multimeter probes

into the terminals will cause damage and intermittent operation of the Actuator.
NOTE: This actuator is utilized to control air temperature to the driver side only for the Dual Zone automatic

climate control system.

NOTE: The temperature test is a subjective check only and careful assessment must be performed to

correctly diagnose Full cooling and Full heating operation from the HVAC. The temperature can vary

depending on factors such as A/C ON/OFF (where fitted), environment air temperature drawn in to HVAC unit

and engine coolant system level and temperature. Incorrect temperature performance without the setting of

either DTC after performing the HVAC On Demand Self Test does not necessitate replacement of the HIM.

NOTE: REFER to Section 412-02 SYMPTOM CHART BEFORE PROCEEDING

Test Step

Result / Action to Take

G1

SYSTEM ON DEMAND SELF TEST

Start and run engine until normal operating temperature is reached.

Yes

Go to G2 if code B1267 is set.

Ensure vehicle battery voltage is within normal operating range

Go to G2 if code B2012 is set.

(12~14volts) before proceeding with test.

No

Using WDS scan tool, record all DTC’s set in the HIM memory.

System OK Refer to Section 413-08.

Using WDS scan tool, clear all DTC’s set in the HIM memory.

Using WDS scan tool, perform HVAC On Demand Self Test.

Are any DTC codes set?

G2

WDS FUNCTIONAL TEST - DRIVER AIR MIX FULL HOT

Connect WDS Scan Tool.

Yes

Go to G3

Ensure engine is running and at normal operating temperature.

No

Select Driver Full Hot using BLENTP.

Ensure engine cooling system is operating

Is the airflow from the HVAC Right Hand side (Driver) hot?

correctly.
Go to G3

G3

WDS FUNCTIONAL TEST - DRIVER AIR MIX FULL COLD

Connect WDS Scan Tool.

Yes

System OK

Ensure engine is running and at normal operating temperature.

No

Select Driver Full Cold using BLENTP.

Ensure Air Conditioning system is operating

Is the airflow from the HVAC Right Hand side (Driver) cool?

correctly.
Go to G4

G4

ELECTRICAL CHECK - DRIVER AIR MIX ACTUATOR

Check dual zone actuator as per “Dual Zone Actuator Terminal

Yes

Connections” in “Connector Diagrams” earlier in this section with the

Go to G5

wiring harness disconnected from the dual zone actuator.

No

Are all checks correct?

Replace dual zone actuator.

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412-04-22 Control 

Components 412-04-22

DIAGNOSIS AND TESTING (Continued)

Test Step

Result / Action to Take

G5

ELECTRICAL CHECK - DRIVER AIR MIX ACTUATOR

Remove the Glove box. Refer to Section 501-12.

Yes

Go to G6

Disconnect the dual zone actuator wiring harness connector C from
the HIM.

No

Replace wiring harness

Disconnect the dual zone wiring harness from Drivers side actuator.

Using a resistance meter, check the continuity of all wiring between
both electrical connectors.

Did all wires have Continuity in each corresponding position?

G6

SYSTEM ON DEMAND SELF TEST

Start and run engine until normal operating temperature is reached.

Yes

Replace HIM.

Ensure vehicle battery voltage is within normal operating range
(12~14volts) before proceeding with test.

No

System OK

Using WDS scan tool, clear all DTC’s set in the HIM memory.

Using WDS scan tool, perform HVAC On Demand Self Test.

Are codes B1267 or B2012 set?

PINPOINT TEST H : INPUT FUNCTION — BATTERY VOLTAGE (ACC / MCC / HTR)

NOTE: This DTC may be accidentally triggered due to a vehicle jump start from a 24 volt battery system.

NOTE: REFER to Section 412-02 SYMPTOM CHART BEFORE PROCEEDING

Test Step

Result / Action to Take

H1

SYSTEM ON DEMAND SELF TEST

Start and run engine until normal operating temperature is reached.

Yes

Go to H2

Ensure vehicle battery voltage is within normal operating range
(12~14volts) before proceeding with test.

No

System OK

Using WDS scan tool, record all DTC’s set in the HIM memory.

Using WDS scan tool, clear all DTC’s set in the HIM memory.

Using WDS scan tool, perform HVAC On Demand Self Test.

Is DTC code B1676 set?

H2

MODULE FUNCTION CHECK - BATTERY VOLTAGE

READING

Connect WDS Scan Tool.

Yes

System OK

Start and run engine.

No

Ensure charging system is within normal vehicle specifications.

Replace HIM

Read Battery voltage from HIM using MC_VREF.

Using a digital voltmeter, attach positive probe to lead 38B and
negative probe to lead 57CB of 12 way connector C-376 and compare
readings.

Is the MC_VREF value within +/-0.5 volt of the digital voltmeter
reading?

PINPOINT TEST I : INPUT FUNCTION — MODULE INTERVAL EEPROM MEMORY (ACC / MCC / HTR)

NOTE: The setting of this DTC is due to incomplete calibration file download from WDS scan tool to HIM.

Care must be taken to ensure that the HIM calibration file is successfully completed before replacing the HIM.

Disturbances to vehicle battery power or the serial CAN bus can interfere with the process. In the event of

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412-04-23 Control 

Components 412-04-23

DIAGNOSIS AND TESTING (Continued)

repeated unsuccessful file download, the HIM has a basic backup of all data stored in the HIM microprocessor

Read Only Memory (ROM). The HIM microprocessor will use the back up data to provide full HVAC system

functionality but may have some degree of noticeable changes to the Climate Control system operating

performance. Both the ROM backup and EEprom calibration data is utilised by all three HIM variants, namely

ACC, MCC and HTR. A PID “CAL_VRAM” is provided to perform a check to determine which calibration data

is loaded to RAM and being used by the HIM microprocessor.
For Example:
The Basic backup calibration data stored in the HIM ROM version is = 1. The HIM Calibration file data stored

in the HIM EEprom version is = 5, or the same number as your current calibration file version. Using WDS

scan tool, request the data for PID “CAL_VRAM” from the HIM.
If the data returned is = 1 Then the HIM microprocessor has load the Basic backup calibration data to RAM

due to a fault in the EEprom calibration data area.

NOTE: The version number for ROM calibration data is always =1.
It is safe to operate the vehicle in the event of EEprom Calibration file download failure.
If the data returned for PID “CAL_VRAM” is = 5 (or the same number as your current calibration file version)

Then the HIM microprocessor has load the update EEprom calibration data to RAM and there is no problem.

(IE. DTC B2141 will not be set.)

NOTE: REFER to Section 412-02 SYMPTOM CHART BEFORE PROCEEDING

Test Step

Result / Action to Take

I1

MODULE CHECK - HIM SYSTEM CALIBRATION FILE

DOWNLOAD

Run engine and ensure vehicle battery condition is of normal charge

Yes

state.

Replace HIM

Connect WDS tester.

No

System OK.

Clear DTC’s in HIM.

Proceed with HIM calibration file download. Wait until file download
process has successfully completed before proceeding any further.

Wait until file download process has successfully completed before
proceeding any further.

Reset the HIM using the WDS scan tool HIM reset button. Or, switch
OFF the ignition and disconnect the HIM 12 and 2way connectors
C-376 from the HIM for 5 minutes and then reconnect both
connectors.

Turn on the ignition and request DTC status from the HIM.

Is DTC B2141 set?

PINPOINT TEST J : INPUT FUNCTION — MODULE CONFIGURATION (ACC / MCC / HTR)

NOTE: The HIM may be configured to operate in any one of three types of modes. Namely, Dual zone

Automatic climate control (ACC), Single zone with A/C (MCC) or Single zone without A/C (HTR).
Firstly, to ensure trouble free operation, the HIM configuration must match the HVAC system type.
Secondly, the ICC must be the correct type to operate the HVAC system. The DTC will be set while the ICC

system does not match the HVAC system type and all climate functions will be inoperable.
Thirdly, the DTC may also be set while the HIM is not configured. This may be the case for a new spare part

HIM only. The DTC code can not be cleared by the WDS test tool. Setting and Clearing of the DTC is

automatically controlled by the HIM.

NOTE: REFER to Section 412-02 SYMPTOM CHART BEFORE PROCEEDING

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412-04-24 Control 

Components 412-04-24

DIAGNOSIS AND TESTING (Continued)

Test Step

Result / Action to Take

J1

VISUAL INSPECTION - ICC TYPE MATCH

Yes

Is ICC the correct type for HVAC system?

Go to J3

No

Go to J2

J2

ICC TYPE INSPECTION

Install the correct ICC system type.

Yes

Go to J3

Check DTC’s stored in HIM using WDS scan tool.

No

Is the HIM DTC B2477 is set?

System OK

J3

MODULE FUNCTION CHECK - HIM MODULE

CONFIGURATION CHECK

Using WDS scan tool, check that the HIM configuration is set correctly

Yes

and matches the HVAC system type.

System OK
DTC will be self Cleared

Is the HIM configured correctly?

No

Set the correct HIM configuration using WDS
scan tool. Refer to “HIM Module Configuration”
earlier in this section.
Check that HIM DTC B2477 is cleared.

PINPOINT TEST K : INPUT FUNCTION — MODULE SERVO ACTUATOR CALIBRATION (ACC/MCC/HTR)

NOTE: This DTC is only set due to the HIM servo Actuators never completing a full calibration process. This

would normally only be the case for a new spare part HIM.

NOTE: REFER to Section 412-02 SYMPTOM CHART BEFORE PROCEEDING

Test Step

Result / Action to Take

K1

MODULE CALIBRATION CHECK - HIM SERVO

ACTUATORS

Yes

Is DTC C1991 set?

Perform HVAC On Demand Self Test.

No

System OK.

PINPOINT TEST L : INPUT FUNCTION — HVAC BLOWER (ACC / MCC / HTR)

NOTE: It is normal for the HVAC Blower to stop operating during excessively high vehicle battery voltage

conditions such as jump starting from a 24 volt power source. The HVAC blower fan will automatically restart

when the vehicle battery voltage returns to normal operating range. The HIM also employs internal HVAC

blower fan speed controller thermal protection. The HVAC blower fan will be disabled when the fan speed

controller heatsink (located within the HIM assembly) has exceeded safe operating temperatures.
Some reasons for fan speed controller heatsink overheat can include,

High temperatures may be artificially produced for reasons such as restricted HVAC air filter by dust or

plastic bag.
Excessive heat drawn in to the HVAC air inlet from the engine bay with the bonnet open.
Face mode selected and all air outlet registers are closed.

The HVAC blower fan should restart after the fan speed controller heat sink has cooled sufficiently and the

Ignition key is then turned OFF and ON.

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