Electronic Climate Control (Ecc) & Heater Module (Hea) Diagnostic Trouble Codes: Other Volvo V40 I рестайлинг

Connecting the breakout box

Special tools

See 9813190

See 9813194

Breakout box and checking ground terminals

Is the breakout box connected? Have the ground terminals been checked?

1. YES Refer to «Checking the control voltage to the damper motor»(ref-441378-S23082016902011121500000)
2. NO Refer to «Areas of use for the breakout box»(ref-441378-S31055717142011121500000)

Areas of use for the breakout box

Breakout box 9813190 is designed to facilitate reading off

1. the control module input and output signals when the control module is connected
2. the resistance of cables and components with the control module disconnected.

The breakout box makes it safer to take readings because it is easier to see and access measurement points. The risk of accidental short-circuits and damaged connector pins is also reduced.

Turn off the power to the ECC control module when connecting the breakout box otherwise the control module may be damaged and incorrect diagnostic trouble codes (DTCs) stored.

Scheme 323

1. Continue Refer to «Connecting the breakout box»(ref-441378-S34597000242011121500000)

1. Refer to «Connecting breakout box between control module and wiring»(ref-441378-S39302079132011121500000)
2. Refer to «Connecting breakout box to wiring only»(ref-441378-S38700128022011121500000)

Scheme 324

Scheme 325

Scheme 326

1. Ignition off
2. ECC control module connected. Check the control module and the control module connector visually according to «Check terminals visually»(ref-441291-S04910850932011121500000) Connect adapter «9813194»(ref-403953-S13746433212011061000000) (only the 30-pin connector) between the ECC control module and the climate control connector. Then connect breakout box «9813190»(ref-403953-S32930552542011061000000) to the adapter. This is connection is carried out when taking readings with the control module connected. The control module terminals 1-30 correspond to terminals 1-30 on the breakout box.

1. Continue Refer to «Checking ground terminals»(ref-441378-S38270060942011121500000)

Scheme 327

Scheme 328

1. Ignition off
2. Disconnect the ECC control module. Check the control module and the control module connector visually according to «Check terminals visually»(ref-441291-S04910850932011121500000) Connect adapter «9813194»(ref-403953-S13746433212011061000000) (only the 30-pin connector) to the climate control system connector. Then connect breakout box «9813190»(ref-403953-S32930552542011061000000) to the adapter. The breakout box is now only connected to the climate control connector. This connection is used to measure resistance in the ECC system cables and components with the ECC control module disconnected. The control module terminals 1-30 correspond to terminals 1-30 on the breakout box.

1. Continue Refer to «Checking ground terminals»(ref-441378-S38270060942011121500000)

Scheme 329

1. Ignition off. Connect an ohmmeter the chassis and terminal 3 to check power ground.

The ohmmeter should read 0ohms.

1. OK Refer to «Checking ground terminals»(ref-441378-S39793712052011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S17775293532011121500000)

Checking ground terminals

Connect an ohmmeter between terminals 3 and 23 on the breakout box.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking the control voltage to the damper motor»(ref-441378-S23082016902011121500000)
2. NOT OK Refer to «Checking breakout box»(ref-441378-S26876113322011121500000)

Scheme 330

1. Ignition off
2. Disconnect the adapter from the ECC control module and from the ECC control module connector. Check the internal cables in the breakout box for the ground terminal which deviated from 0 ohms. Connect an ohmmeter between: breakout box terminal 3 and adapter connector terminal 3 breakout box terminal 23 and adapter connector terminal 23.

The ohmmeter should read 0 ohms.

1. OK Refer to «Replacing the component»(ref-441378-S34115708752011121500000)
2. NOT OK Refer to «Replacing the component»(ref-441378-S15719606042011121500000)

Replacing the component

1. Try a new ECC control module according to «Control module, climate»(ref-441328-S07954369152011121500000) .

1. Continue Refer to «Verification»(ref-441378-S06822956442011121500000)

Checking for an open-circuit

Check the ground lead between the 30 pin connector terminal 3 (ECC control module side) and ground terminal relay box 15/14, ground rail D8, for an open-circuit according to Open-circuit, permanent faults

Scheme 331

Is there an open-circuit in the cable?

1. YES Refer to «Remedy open-circuit»(ref-441378-S00165228932011121500000)
2. NO Refer to «Checking for an open-circuit»(ref-441378-S07618353812011121500000)

Check for an open-circuit between ground rail D10 and chassis Open-circuit, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S06822956442011121500000)

Remedy open-circuit

1. Remedy open-circuit.

1. Continue Refer to «Verification»(ref-441378-S06822956442011121500000)

1. Disconnect adapter «9813194»(ref-403953-S13746433212011061000000) from the breakout box «9813190»(ref-403953-S32930552542011061000000) . Check the relevant leads in the breakout box and adapter to establish where the fault is. Replace breakout box or adapter.

1. Continue Refer to «Checking ground terminals»(ref-441378-S38270060942011121500000)

Scheme 332

Scheme 333

1. Ignition on
2. ECC control module connected.
3. Connect a stand-alone multimeter, set to volts, between terminals 11 and 12 on the breakout box. For information about self-adjustment, see «Self adjustment of damper motor limit positions»(ref-441329-S22377793302011121500000) . Activate the self-adjustment function by clicking on the VCT 2000 symbol. Read off the multimeter. The voltmeter value should vary from 0 V to 10 V (depending on whether the shutter is opening or closing) and back to 0 V in approximately 12 seconds.

Are these conditions fulfilled?

1. YES Refer to «Checking components»(ref-441378-S36071224182011121500000)
2. NO Refer to «Checking for a short-circuit»(ref-441378-S36731375422011121500000)

Scheme 334

Scheme 335

1. Ignition off
2. The connector for the recirculation damper motor is disconnected. Connect an ohmmeter between terminals 2 and 6 on the damper motor connector. The ohmmeter should display approximately 120 ohms.

Is the value OK?

1. YES Refer to «Checking components»(ref-441378-S31617944642011121500000)
2. NO Refer to «Replacing the component»(ref-441378-S12475088722011121500000)

Checking components

1. Rotate the output shaft on the damper motor: Connect battery voltage between terminals 2 and 6 on the damper motor connector
2. Interrupt the voltage when the output shaft for the damper motor is at one of its end positions
3. Reverse the polarity (across damper motor connector terminals 2 and 6) so that the output shaft for the damper motor returns to its original position.

Scheme 336

Does the damper motor react according to the above description?

1. YES Refer to «Verification»(ref-441378-S24455402112011121500000)
2. NO Refer to «Replacing the component»(ref-441378-S12475088722011121500000)

1. Replace the recirculation damper motor according to «Recirculation»(ref-441328-S26344738492011121500000) .

1. Continue Refer to «Self-adjustment of the shutter motor end position»(ref-441378-S07532122152011121500000)

Checking for a short-circuit

1. If the voltmeter reads 0 V continuously, check for a short-circuit to ground. Refer to «Checking for a short-circuit»(ref-441378-S26071198982011121500000)
2. If the voltmeter reads 12 V continuously, check for a short-circuit to supply voltage. Refer to «Checking for a short-circuit»(ref-441378-S22170374802011121500000)

Scheme 337

1. Ignition off
2. Disconnect the connector for the recirculation damper motor according to «Recirculation»(ref-441328-S26344738492011121500000)
3. Disconnect the ECC control module. Connect an ohmmeter between ground and the recirculation damper motor connector as follows. Take care not to damage the connecting sockets on the connector. Connect one of the ohmmeter test probes to ground Connect the other ohmmeter test probe to the connector terminal 2. Read of the value Then connect the other ohmmeter test probe to the female half of the connector terminal 6. Read of the value. If the value from one cable is approximately 0 ohms, there is a short-circuit to ground in the cable.

1. Continue Refer to «Checking for a short-circuit, continued»(ref-441378-S35648717922011121500000)

Checking for a short-circuit, continued

Check one of the following cables for a short-circuit to ground according to Short-circuit to ground, permanent faults

1. the cable from the damper motor connector terminal 2 on the female half, to the ECC control module connector terminal 7 on the female half
2. the cable from the damper motor connector terminal 6 on the female half, to the ECC control module connector terminal 8 on the female half.

1. Continue Refer to «Verification»(ref-441378-S24455402112011121500000)

1. Ignition off
2. Disconnect the connector for the recirculation damper motor according to «Recirculation»(ref-441328-S26344738492011121500000)
3. Disconnect the ECC control module.
4. Disconnect the battery positive lead. Connect an ohmmeter between the disconnected battery positive lead and the female half of the connector for the recirculation damper motor as follows. Take care not to damage the connecting sockets on the connector. Connect one of the ohmmeter test probes to ground Connect the other ohmmeter test probe to the connector terminal 2. Read of the value Then connect the other ohmmeter test probe to the female half of the connector terminal 6. Read of the value. If the value from one cable is approximately 0 ohms, there is a short-circuit to supply voltage in the cable.

1. Continue Refer to «Checking for a short-circuit, continued»(ref-441378-S01780271622011121500000)

Check one of the following cables for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults

1. the cable from the damper motor connector terminal 2 on the female half, to the ECC control module connector terminal 7 on the female half
2. the cable from the damper motor connector terminal 6 on the female half, to the ECC control module connector terminal 8 on the female half.

1. Continue Refer to «Verification»(ref-441378-S24455402112011121500000)

Verification

HINT: Check after repair that the fault has been rectified.

Scheme 338

Scheme 339

1. Ignition off
2. Reconnect connectors, reinstall components etc.
3. ECC- control module connected.
4. Engine running
5. VCT2000 connected to the data link connector (DLC). Establish communication with the ECC -system.

1. Continue Refer to «Verification, continued»(ref-441378-S12666404242011121500000)

Verification, continued

1. For further information about self-adjustment, see «Self adjustment of damper motor limit positions»(ref-441329-S22377793302011121500000) . Click the VCT2000 symbol to activate the self adjustment function.

1. Continue Refer to «Verification, continued»(ref-441378-S23486809442011121500000)

Click on the VCT2000 symbol to read off the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S30629091022011121500000)

Erase diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S31531390592011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S12395156072011121500000)
2. NO Refer to «Checking the control voltage to the damper motor»(ref-441378-S23082016902011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off
2. Reconnect connectors, reinstall components etc.
3. ECC- control module connected.
4. Engine running
5. VCT2000 connected to the data link connector (DLC). Establish communication with the ECC -system.

1. Continue Refer to «Verification, continued»(ref-441378-S25705177292011121500000)

1. For further information about self-adjustment, see «Self adjustment of damper motor limit positions»(ref-441329-S22377793302011121500000) . Click the VCT2000 symbol to activate the self adjustment function.

1. Continue Refer to «Verification, continued»(ref-441378-S02674506022011121500000)

Click on the VCT2000 symbol to read off the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S22924107792011121500000)

Erase diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S35590693912011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S12395156072011121500000)
2. NO VERIFIED: Troubleshooting has been completed.

Fault-tracing information

The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.

Complete the fault-tracing for those fault or try again.

Special tools

See 9813190

See 9813194

Is the breakout box connected? Have the ground terminals been checked?

1. YES Refer to «Checking voltage»(ref-441378-S28377471702011121500000)
2. NO Refer to «Areas of use for the breakout box»(ref-441378-S14415636042011121500000)

Breakout box 9813190 is designed to facilitate reading off

1. the control module input and output signals when the control module is connected
2. the resistance of cables and components with the control module disconnected.

The breakout box makes it safer to take readings because it is easier to see and access measurement points. The risk of accidental short-circuits and damaged connector pins is also reduced.

Turn off the power to the ECC control module when connecting the breakout box otherwise the control module may be damaged and incorrect diagnostic trouble codes (DTCs) stored.

1. Continue Refer to «Connecting the breakout box»(ref-441378-S41267225592011121500000)

1. Refer to «Connecting breakout box between control module and wiring»(ref-441378-S35148595142011121500000)
2. Refer to «Connecting breakout box to wiring only»(ref-441378-S13056759502011121500000)

1. Ignition off. Connect an ohmmeter the chassis and terminal 3 to check power ground.

The ohmmeter should read 0ohms.

1. OK Refer to «Checking ground terminals»(ref-441378-S10924385402011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S29577426722011121500000)

Connect an ohmmeter between terminals 3 and 23 on the breakout box.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking voltage»(ref-441378-S28377471702011121500000)
2. NOT OK Refer to «Checking breakout box»(ref-441378-S20838103312011121500000)

Checking breakout box

1. Ignition off
2. Disconnect the adapter from the ECC control module and from the ECC control module connector. Check the internal cables in the breakout box for the ground terminal which deviated from 0 ohms. Connect an ohmmeter between: breakout box terminal 3 and adapter connector terminal 3 breakout box terminal 23 and adapter connector terminal 23.

The ohmmeter should read 0 ohms.

1. OK Refer to «Replacing the component»(ref-441378-S27059511932011121500000)
2. NOT OK Refer to «Replacing the component»(ref-441378-S12204344812011121500000)

1. Try a new ECC control module according to «Control module, climate»(ref-441328-S07954369152011121500000) .

1. Continue Refer to «Verification»(ref-441378-S34030285362011121500000)

Check the ground lead between the 30 pin connector terminal 3 (ECC control module side) and ground terminal relay box 15/14, ground rail D8, for an open-circuit according to Open-circuit, permanent faults

Is there an open-circuit in the cable?

1. YES Refer to «Remedy open-circuit»(ref-441378-S28345970252011121500000)
2. NO Refer to «Checking for an open-circuit»(ref-441378-S36332866192011121500000)

Check for an open-circuit between ground rail D10 and chassis Open-circuit, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S34030285362011121500000)

1. Remedy open-circuit.

1. Continue Refer to «Verification»(ref-441378-S34030285362011121500000)

1. Disconnect adapter «9813194»(ref-403953-S13746433212011061000000) from the breakout box «9813190»(ref-403953-S32930552542011061000000) . Check the relevant leads in the breakout box and adapter to establish where the fault is. Replace breakout box or adapter.

1. Continue Refer to «Checking ground terminals»(ref-441378-S39455492552011121500000)

Scheme 340

1. Ignition on. Connect a voltmeter between terminals 3 and 28 on the breakout box. The voltmeter should display the following values at the blower fan switch positions below: Position AUTO: approximately 0 V Position 0: approximately 0 V Position 1: approximately 1.3 V Position 2: approximately 1.4 V Position 3: approximately 1.5 V Position 4: approximately 1.7 V.

Are the voltage readings OK?

1. YES Refer to «Checking the resistance in the cable»(ref-441378-S06942666302011121500000)
2. NO Refer to «Replacing the component»(ref-441378-S27887661702011121500000)

Scheme 341

1. Ignition off
2. Disconnect the ECC control module
3. Disconnect the connector from the blower fan power unit. Connect an ohmmeter between ECC control module connector terminal 28 and terminal 3 on the connector for the blower fan power unit.

The ohmmeter should read 0 ohms.

1. OK Refer to «Checking the resistance in the cable»(ref-441378-S32474970042011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S40855563242011121500000)

Checking the resistance in the cable

1. Ignition off
2. The connector for the blower fan power unit is disconnected. Connect an ohmmeter between ground (0 V) and terminal 2 on the connector for the blower fan power unit.

The ohmmeter should read 0 ohms.

1. OK Refer to «Checking the resistance in the cable»(ref-441378-S38156344192011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S39567145572011121500000)

Check the cable between ECC control module connector terminal 28 and terminal 3 on the connector for the blower fan power unit for an open-circuit according to Open-circuit, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S05620391852011121500000)

Scheme 342

1. Ignition off
2. Disconnect the connector from the blower fan motor. Connect an ohmmeter between blower fan motor connector terminal 2 and terminal 4 on the connector for the blower fan power unit.

The ohmmeter should read approximately 0ohms.

1. OK Refer to «Replacing the component»(ref-441378-S31857124922011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S02199611722011121500000)

Check the cable between ground (0 V) and terminal 2 on the connector for the blower fan power unit for an open-circuit according to Open-circuit, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S05620391852011121500000)

1. Replace the blower fan motor according to «Fan motor»(ref-441328-S32087737552011121500000) .

1. Continue Refer to «Verification»(ref-441378-S05620391852011121500000)

1. Replace the blower fan power unit.

1. Continue Refer to «Verification»(ref-441378-S05620391852011121500000)

Check the cable between terminal 2 on the connector for the blower fan motor and terminal 4 on the connector for the blower fan power unit for an open-circuit according to Open-circuit, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S05620391852011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off
2. Reconnect connectors, reinstall components etc.
3. ECC- control module connected.
4. Engine running
5. VCT2000 connected to the data link connector (DLC). Establish communication with the ECC -system.

1. Continue Refer to «Verification, continued»(ref-441378-S23574152092011121500000)

1. For further information about self-adjustment, see «Self adjustment of damper motor limit positions»(ref-441329-S22377793302011121500000) . Click the VCT2000 symbol to activate the self adjustment function.

1. Continue Refer to «Verification, continued»(ref-441378-S34397839882011121500000)

Click on the VCT2000 symbol to read off the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S28479071862011121500000)

Erase diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S06217088152011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S33049575942011121500000)
2. NO Refer to «Checking voltage»(ref-441378-S28377471702011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off.
2. Connect the connectors, reinstall components etc.
3. ECC control module connected.
4. Engine running.
5. VCT 2000 connected to the data link connector (DLC). Establish communication with the ECC system.

1. Continue Refer to «Verification, continued»(ref-441378-S28030610712011121500000)

Check that the blower fan reacts correctly by setting the blower fan switch to positions 0 to 4 (including AUTO).

1. Continue Refer to «Verification, continued»(ref-441378-S17080417502011121500000)

Read off diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S33324083462011121500000)

Erase the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S24734767042011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S33049575942011121500000)
2. NO VERIFIED: Troubleshooting has been completed.

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking resistance

1. Ignition off
2. Disconnect the connector from the blower fan power unit
3. ECC control module connected. Connect an ohmmeter between ground (0 V) and terminal 3 on the connector for the blower fan power unit.

The ohmmeter should read infinity.

1. OK Refer to «Replacing the component»(ref-441378-S19682873492011121500000)
2. NOT OK Refer to «Checking for a short-circuit»(ref-441378-S38946688522011121500000)

1. Replace the blower fan power unit.

1. Continue Refer to «Verification»(ref-441378-S25346608832011121500000)

Check the cable between ECC control module connector terminal 28 and terminal 3 on the connector for the blower fan motor power unit for a short-circuit to ground according to Short-circuit to ground, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S25346608832011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off.
2. Connect the connectors, reinstall components etc.
3. ECC control module connected.
4. Engine running.
5. VCT 2000 connected to the data link connector (DLC). Establish communication with the ECC system.

1. Continue Refer to «Verification, continued»(ref-441378-S42198492132011121500000)

Check that the blower fan reacts correctly by setting the blower fan switch to positions 0 to 4 (including AUTO).

1. Continue Refer to «Verification, continued»(ref-441378-S33916230142011121500000)

Read off diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S24171279682011121500000)

Erase the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S39869326302011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S26024096582011121500000)
2. NO VERIFIED: Troubleshooting has been completed.

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Special tools

See 9813190

See 9813194

Is the breakout box connected? Have the ground terminals been checked?

1. YES Refer to «Checking voltage»(ref-441378-S29471143652011121500000)
2. NO Refer to «Areas of use for the breakout box»(ref-441378-S10040788382011121500000)

Breakout box 9813190 is designed to facilitate reading off

1. the control module input and output signals when the control module is connected
2. the resistance of cables and components with the control module disconnected.

The breakout box makes it safer to take readings because it is easier to see and access measurement points. The risk of accidental short-circuits and damaged connector pins is also reduced.

Turn off the power to the ECC control module when connecting the breakout box otherwise the control module may be damaged and incorrect diagnostic trouble codes (DTCs) stored.

1. Continue Refer to «Connecting the breakout box»(ref-441378-S39642788012011121500000)

1. Refer to «Connecting breakout box between control module and wiring»(ref-441378-S04792931952011121500000)
2. Refer to «Connecting breakout box to wiring only»(ref-441378-S26493269432011121500000)

1. Ignition off. Connect an ohmmeter the chassis and terminal 3 to check power ground.

The ohmmeter should read 0 ohms.

1. OK Refer to «Checking ground terminals»(ref-441378-S30681302402011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S31582778812011121500000)

Connect an ohmmeter between terminals 3 and 23 on the breakout box.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking voltage»(ref-441378-S29471143652011121500000)
2. NOT OK Refer to «Checking breakout box»(ref-441378-S25641354002011121500000)

1. Ignition off
2. Disconnect the adapter from the ECC control module and from the ECC control module connector. Check the internal cables in the breakout box for the ground terminal which deviated from 0 ohms. Connect an ohmmeter between: breakout box terminal 3 and adapter connector terminal 3 breakout box terminal 23 and adapter connector terminal 23.

The ohmmeter should read 0 ohms.

1. OK Refer to «Replacing the component»(ref-441378-S28330908212011121500000)
2. NOT OK Refer to «Replacing the component»(ref-441378-S34739765332011121500000)

1. Try a new ECC control module according to «Control module, climate»(ref-441328-S07954369152011121500000) .

1. Continue Refer to «Verification»(ref-441378-S31526422392011121500000)

Check the ground lead between the 30 pin connector terminal 3 (ECC control module side) and ground terminal relay box 15/14, ground rail D8, for an open-circuit according to Open-circuit, permanent faults

Is there an open-circuit in the cable?

1. YES Refer to «Remedy open-circuit»(ref-441378-S39203010202011121500000)
2. NO Refer to «Checking for an open-circuit»(ref-441378-S32685758362011121500000)

Check for an open-circuit between ground rail D10 and chassis Open-circuit, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S31526422392011121500000)

1. Remedy open-circuit.

1. Continue Refer to «Verification»(ref-441378-S31526422392011121500000)

1. Disconnect adapter «9813194»(ref-403953-S13746433212011061000000) from the breakout box «9813190»(ref-403953-S32930552542011061000000) . Check the relevant leads in the breakout box and adapter to establish where the fault is. Replace breakout box or adapter.

1. Continue Refer to «Checking ground terminals»(ref-441378-S35703485152011121500000)

Checking voltage

1. Ignition on. Connect a voltmeter between terminals 3 and 29 on the breakout box. The voltmeter should display the following values at the blower fan switch positions below: Position 0: approximately 12 V Position 1: approximately 12 V Position 2: approximately 12 V Position 3: approximately 12 V Position 4: approximately 12 V Position 5: approximately 0.8 V.

Are the voltage readings OK?

1. YES Refer to «Checking the resistance in the cable»(ref-441378-S17106983802011121500000)
2. NO Refer to «Checking the resistance in the cable»(ref-441378-S16585512062011121500000)

Scheme 343

1. Ignition off
2. Disconnect the ECC control module.
3. Remove the fan relay. Connect an ohmmeter between ECC control module connector terminal 29 and blower fan relay base terminal 3.

The ohmmeter should read 0 ohms.

1. OK Refer to «Checking the resistance in the cable»(ref-441378-S02575993692011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S14114215042011121500000)

1. Ignition off. Connect an ohmmeter between ground (0 V) and blower fan relay base terminal 2.

The ohmmeter should read 0 ohms.

1. OK Refer to «Checking voltage»(ref-441378-S11759408432011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S24087283032011121500000)

Check the cable between ECC control module connector terminal 29 and blower fan relay base terminal 3 for an open-circuit according to Open-circuit, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S03087472622011121500000)

1. Ignition off
2. Remove the fan relay. Connect a voltmeter between ground and terminal 1 on the blower fan relay base. Ignition on.

The voltmeter should read approximately battery voltage.

1. OK Refer to «Replacing the component»(ref-441378-S18771149562011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S41865578382011121500000)

Check the cable between ground (0 V) and terminal 2 on the blower fan relay base for an open-circuit according to Open-circuit, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S03087472622011121500000)

Scheme 344

1. Ignition off
2. Disconnect the connector from the blower fan. Connect an ohmmeter between blower fan motor connector terminals 2 and 4 on the blower fan relay base.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Replacing the component»(ref-441378-S18771149562011121500000)
2. NOT OK Refer to «Checking for an open-circuit»(ref-441378-S29086530082011121500000)

Check the cable between blower fan motor connector terminal 2 and blower fan relay base terminal 4 for an open-circuit according to Open-circuit, permanent faults .

1. Continue Refer to «Verification»(ref-441378-S03087472622011121500000)

1. Replace the fan relay.

1. Continue Refer to «Verification»(ref-441378-S03087472622011121500000)

Check the cable between terminal 1 on the heater unit relay base (2) in the integrated relay/fusebox in the passenger compartment and blower fan relay base terminal 2 for a short-circuit according to Open-circuit, permanent faults

Scheme 345

Scheme 346

1. Continue Refer to «Verification»(ref-441378-S03087472622011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off
2. Reconnect connectors, reinstall components etc.
3. ECC- control module connected.
4. Engine running
5. VCT2000 connected to the data link connector (DLC). Establish communication with the ECC -system.

1. Continue Refer to «Verification, continued»(ref-441378-S32858944272011121500000)

1. For further information about self-adjustment, see «Self adjustment of damper motor limit positions»(ref-441329-S22377793302011121500000) . Click the VCT2000 symbol to activate the self adjustment function.

1. Continue Refer to «Verification, continued»(ref-441378-S30612766402011121500000)

Click on the VCT2000 symbol to read off the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S35085029982011121500000)

Erase diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S31750091172011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S28870712892011121500000)
2. NO Refer to «Checking voltage»(ref-441378-S29471143652011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off.
2. Reconnect connectors, reinstall components etc.
3. ECC control module connected.
4. VCT 2000 connected to the data link connector (DLC).
5. Ignition on. Check that the fan reacts correctly: Set the blower fan switch to position 5.

Were the values OK?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S28870712892011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

1. Ignition off.
2. Remove the fan relay.
3. ECC control module connected. Connect an ohmmeter between terminals 1 and 3 on the relay base.

The ohmmeter should read approximately 130 ohms.

1. OK Refer to «Checking for a short-circuit»(ref-441378-S32128984482011121500000)
2. NOT OK Refer to «Replacing the component»(ref-441378-S38700091852011121500000)

Check the cable between relay base terminals 3 and 29 on the ECC control module connector for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults

1. Continue Refer to «Verification»(ref-441378-S26469696112011121500000)

1. Replace the fan relay.

1. Continue Refer to «Verification»(ref-441378-S26469696112011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off.
2. Reconnect connectors, reinstall components etc.
3. ECC control module connected.
4. VCT 2000 connected to the data link connector (DLC).
5. Ignition on. Check that the fan reacts correctly: Set the blower fan switch to position 5.

Were the values OK?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S27297970902011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

1. Replace the ECC control module according to «Control module, climate»(ref-441328-S07954369152011121500000) .

1. Continue Refer to «Self-adjustment of the damper motor end positions»(ref-441378-S34061764182011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off.
2. Connect the connectors, reinstall components etc.
3. ECC control module connected.
4. Ignition on.
5. VCT 2000 connected to data link connector (DLC). Establish communication with the ECC system.

1. Continue Refer to «Verification, continued»(ref-441378-S11861707802011121500000)

Read off diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S37494519822011121500000)

Erase the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S41324508602011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S08050285672011121500000)
2. NO VERIFIED: Troubleshooting has been completed.

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

1. Replace the ECC control module according to «Control module, climate»(ref-441328-S07954369152011121500000) .

1. Continue Refer to «Self-adjustment of the damper motor end positions»(ref-441378-S19083024132011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off.
2. Connect the connectors, reinstall components etc.
3. ECC control module connected.
4. Ignition on.
5. VCT 2000 connected to data link connector (DLC). Establish communication with the ECC system.

1. Continue Refer to «Verification, continued»(ref-441378-S16122673872011121500000)

Read off diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S04760714452011121500000)

Erase the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S10382178522011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S20980681812011121500000)
2. NO VERIFIED: Troubleshooting has been completed.

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

1. Ignition off
2. Disconnect the connector from the blower fan
3. ECC control module connected. Remove the blower fan from climate control system according to Check by hand whether the blower fan rotor blades can rotate freely when the blower fan is removed Check that there is enough space for the blower fan rotor to rotate in the climate control system. Check that the blower fan is unimpeded.

1. If there is a blockage, refer to «Remedy the blockage»(ref-441378-S39470527842011121500000)
2. If the blower fan rotor cannot rotate freely or is sluggish, refer to «Replacing the component»(ref-441378-S24283449192011121500000)

Remedy the blockage

1. Remedy the blockage.

1. Continue Refer to «Verification»(ref-441378-S03258075122011121500000)

1. Replace the blower fan according to «Fan motor»(ref-441328-S32087737552011121500000) .

1. Continue Refer to «Verification»(ref-441378-S03258075122011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off.
2. Connect the connectors, reinstall components etc.
3. ECC control module connected.
4. Ignition on.
5. VCT 2000 connected to data link connector (DLC). Establish communication with the ECC system.

1. Continue Refer to «Verification, continued»(ref-441378-S08431404992011121500000)

Read off diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S17427618582011121500000)

Erase the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S07782625822011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S15365031382011121500000)
2. NO VERIFIED: Troubleshooting has been completed.

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

1. Replace the ECC control module according to «Control module, climate»(ref-441328-S07954369152011121500000) .

1. Continue Refer to «Self-adjustment of the damper motor end positions»(ref-441378-S23966630472011121500000)

HINT: Check after repair that the fault has been rectified.

1. Ignition off.
2. Connect the connectors, reinstall components etc.
3. ECC control module connected.
4. Ignition on.
5. VCT 2000 connected to data link connector (DLC). Establish communication with the ECC system.

1. Continue Refer to «Verification, continued»(ref-441378-S18525337762011121500000)

Read off diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S38230300282011121500000)

Erase the diagnostic trouble codes (DTCs).

1. Continue Refer to «Verification, continued»(ref-441378-S37293361852011121500000)

Check that diagnostic trouble codes (DTCs) do not recur.

Do the diagnostic trouble codes (DTCs) recur?

1. YES Refer to «Information»(ref-441378-S42909415602011121500000)
2. NO VERIFIED: Troubleshooting has been completed.

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking the function of the heater

1. Ignition on. NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
2. Activate the heater. For information about how the heater should operate when running, see «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater start?

1. YES Refer to «Intermittent fault»(ref-441378-S14321672062011121500000)
2. NO Refer to «Replacing the control module»(ref-441378-S30567378122011121500000)

Replacing the control module

Note. Before replacing the control module the other stored diagnostic trouble codes (DTCs) must be replaced first.

1. Ignition off. Try a new control module according to «Replacing the control module»(ref-441328-S25218373662011121500000) .

1. Continue Refer to «Information»(ref-441378-S30987000362011121500000)

Intermittent fault

Fault-tracing indicates that the control module has previously registered an intermittent fault but that the fault is no longer present.

1. Continue Refer to «Information»(ref-441378-S30987000362011121500000)

In case of this defect, troubleshooting is not followed by verification.

The information can be displayed again or the fault-tracing for this fault can be interrupted.

General fault/Parameter fault

See General fault/Parameter fault

Checking outside temperature sensor function

1. Ignition on.
2. Read off outside temperature. Check the outside temperature reading is correct. Compare with the actual air temperature.

Is the temperature reading OK?

1. YES Refer to «Intermittent fault»(ref-441378-S25568752912011121500000)
2. NO Refer to «Checking the connectors»(ref-441378-S13761403412011121500000)

Checking the connectors

1. Ignition off.
2. Remedy outside temperature sensor and control module connector for «Contact resistance and oxidation»(ref-441291-S41448420802011121500000) . Check any damage etc.
3. Reinstall components, reconnect connectors etc.
4. Ignition on.
5. Read off outside temperature. Check that the outside temperature is within its permitted range. Compare with the actual air temperature. If temperature is now OK this indicates that the fault was caused by poor contact in the connectors. Other information: To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) . To access/replace the outside temperature sensor, see «Outside temperature sensor and glow plugs, replace»(ref-441328-S05161552132011121500000) .

Is the temperature reading OK?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking component and cables»(ref-441378-S00073664782011121500000)

Checking component and cables

Check outside temperature sensor resistance. For resistance values, refer to Component resistance values .

Check cable between control module #4 and outer temperature sensor terminal 2 for an open-circuit according to Open-circuit, permanent faults .

Check cable between control module #7 and outer temperature sensor terminal 1 for an open-circuit according to Open-circuit, permanent faults and for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults

Note. If there are faults in the ground lead, diagnostic trouble code (DTC) HEA-801 Coolant temperature sensor may also be stored.

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the outside temperature sensor see «Outside temperature sensor and glow plugs, replace»(ref-441328-S05161552132011121500000) .
3. With ignition on and outside temperature sensor connector disconnected, the voltage between outside temperature sensor connector terminal 1 (control module side) and ground should be approximately 5 V.
4. With ignition of and outside temperature sensor connector disconnected the resistance between outside temperature sensor connector terminal 2 (control module side) and ground should be approximately 0 ohms.
5. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

Scheme 347

Scheme 348

1. Continue Refer to «Verification»(ref-441378-S37011855032011121500000)

Check cable between control module #7 and outside temperature sensor terminal 1 and cable between control module #4 and outside temperature sensor terminal 2 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the outside temperature sensor see «Outside temperature sensor and glow plugs, replace»(ref-441328-S05161552132011121500000) .
3. With ignition on and outside temperature sensor connector disconnected, the voltage between outside temperature sensor connector terminal 1 (control module side) and ground should be approximately 5 V.
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S12324736412011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off.
2. Reinstall connectors, components etc.
3. Ignition on.
4. Read off outside temperature. Check the outside temperature reading is correct. Compare with the actual air temperature.

Is the temperature reading OK?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S12324736412011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

1. Ignition on.
2. Read off outside temperature. Check the outside temperature reading is correct. Compare with the actual air temperature.

Is the temperature reading OK?

1. YES Refer to «Intermittent fault»(ref-441378-S35709660702011121500000)
2. NO Refer to «Checking component and cables»(ref-441378-S17452877682011121500000)

Check outside temperature sensor resistance. For resistance values, refer to Component resistance values .

Check cable between control module #7 and outside temperature sensor terminal 1 for a short-circuit to ground according to Short-circuit to ground, permanent faults .

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the outside temperature sensor, see «Outside temperature sensor and glow plugs, replace»(ref-441328-S05161552132011121500000) .
3. With ignition on and outside temperature sensor connector disconnected, the voltage between outside temperature sensor connector terminal 1 (control module side) and ground should be approximately 5 V.
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Verification»(ref-441378-S13068022022011121500000)

Check cable between control module #7 and outside temperature sensor terminal 1 for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the outside temperature sensor, see «Outside temperature sensor and glow plugs, replace»(ref-441328-S05161552132011121500000) .
3. With ignition on and outside temperature sensor connector disconnected, the voltage between outside temperature sensor connector terminal 1 (control module side) and ground should be approximately 5 V.
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S38193076702011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off.
2. Reinstall connectors, components etc.
3. Ignition on.
4. Read off outside temperature. Check the outside temperature reading is correct. Compare with the actual air temperature.

Is the temperature reading OK?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S38193076702011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking engine coolant temperature (ECT) sensor function

1. Ignition on.
2. Read off coolant temperature. Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Is the temperature reading OK?

1. YES Refer to «Intermittent fault»(ref-441378-S01404246342011121500000)
2. NO Refer to «Checking the connectors»(ref-441378-S20319217342011121500000)

1. Ignition off.
2. Check control module connector for contact resistance and oxidation and remedy according to «Contact resistance and oxidation»(ref-441291-S41448420802011121500000) . Check any damage etc.
3. Reinstall components, reconnect connectors etc.
4. Ignition on.
5. Read off coolant temperature. Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine. If the temperature is now OK it means that the fault was caused by loose connections in the connector Other information: To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .

Is the temperature reading OK?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking component and cables»(ref-441378-S21616759202011121500000)

Check engine coolant temperature sensor resistance. For resistance values, refer to Component resistance values .

Check cable between control module #4 and engine coolant temperature sensor ground terminal for an open-circuit according to Open-circuit, permanent faults .

HINT: Because it is difficult to separate the cables to the engine coolant temperature sensor, measure between control module #4 and both cables to the water temperature sensor.

Check cable between control module #16 and engine coolant temperature sensor signal terminal for an open-circuit Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: Because it is difficult to separate the cables to the engine coolant temperature sensor test the cables one at a time and see if a relevant value was obtained from either of them.

Note. Diagnostic trouble code (DTC) HEA-142 outside temperature sensor is stored with faults in the ground lead

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the Coolant temperature sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .
3. With ignition on and engine coolant temperature sensor signal cable cut the voltage between engine coolant temperature sensor signal cable (engine control module (ECM) side) and ground should be approximately 5 V.
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Verification»(ref-441378-S01060288092011121500000)

Check control module connector for contact resistance and oxidation according to Contact resistance and oxidation .

Check circuit for an intermittent open-circuit by measuring resistance between control module connector #16 and #4 (towards the sensor) and follow the instructions according to Open-circuit, intermittent faults . Resistance should be according to Component resistance values .

Check cable between control module #16 and engine coolant temperature sensor for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the Coolant temperature sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .
3. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S16543946202011121500000) OKAY: Troubleshooting has been completed.

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off.
2. Reinstall connectors, components etc.
3. Ignition on.
4. Read off coolant temperature. Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Is the temperature within its permitted range?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S16543946202011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

1. Ignition on.
2. Read off coolant temperature. Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Is the temperature reading OK?

1. YES Refer to «Intermittent fault»(ref-441378-S10393666632011121500000)
2. NO Refer to «Checking component and cables»(ref-441378-S26337928282011121500000)

Check engine coolant temperature sensor resistance. For resistance values, refer to Component resistance values .

Check cable between control module #16 and the engine coolant temperature (ECT) sensor signal connection for a short-circuit to ground according to Short-circuit to ground, permanent faults .

HINT: Because it is difficult to separate the engine coolant temperature sensor ground lead from the signal cable, one must measure one cable at a time and see if the permitted values are present on either of them.

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace Coolant temperature sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .
3. With ignition on and engine coolant temperature sensor signal cable cut the voltage between engine coolant temperature sensor signal cable (engine control module (ECM) side) and ground should be approximately 5 V.
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Verification»(ref-441378-S26077150412011121500000)

Check cable between control module #16 and engine coolant temperature sensor signal terminal for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace Coolant temperature sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .
3. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S30525217242011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off.
2. Reinstall connectors, components etc.
3. Ignition on.
4. Read off coolant temperature. Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Is the temperature within its permitted range?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S30525217242011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking the function of the flame sensor

1. Ignition on. NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
2. Activate the heater. For information about how the heater should operate when running, see «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater start?

1. YES Refer to «Intermittent fault»(ref-441378-S09789195212011121500000)
2. NO Refer to «Checking components and wiring»(ref-441378-S37101447072011121500000)

Check the cable between control module terminal #8 and the signal terminal for the flame sensor. Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000)
2. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S10498188812011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on. NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
4. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S10498188812011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Check control module connector for Contact resistance and oxidation .

Check flame sensor circuit for an intermittent open-circuit according to Open-circuit, intermittent faults .

Check cable between control module #8 and flame sensor signal terminal for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the flame sensor see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .
3. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S36045473462011121500000)

Selecting Parking heater or Additional heater

Fault-tracing for this diagnostic trouble code (DTC) can differ depending whether the heater is functioning as an Additional Heater or as a Parking heater as well.

The major difference between the two methods is that the Additional heater has the fuel pump (FP) installed at the heater and the fuel lines are connected to the return side on the engine fuel system at the engine. If the installation is used as a parking heater the fuel pump is installed at the fuel tank and the fuel lines are routed from the fuel tank to the heater, there is also a Timer installed in the passenger compartment.

Scheme 349

Is the heater also used as a parking heater?

1. YES Refer to «Checking fuel lines, parking heater»(ref-441378-S38151129192011121500000)
2. NO Refer to «Checking fuel lines, additional heater»(ref-441378-S06768177802011121500000)

Checking fuel lines, additional heater

Scheme 350

1. To expose the heater and get access to the fuel lines refer to «Removing bumper»(ref-441328-S09218020772011121500000) . Check fuel lines between connection point at the engine fuel system and heater via fuel pump (FP), for damage and leakage. Also check fuel lines for blockage. Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S16349118842011121500000)
2. NO Refer to «Checking the fuel pump (FP)»(ref-441378-S26096443502011121500000)

Checking fuel lines, parking heater

1. To expose the heater and get access to the fuel lines refer to «Removing bumper»(ref-441328-S09218020772011121500000) . Check fuel lines between fuel tank and heater via the fuel pump, for damage and leaks. Also check fuel lines for blockage. Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S16349118842011121500000)
2. NO Refer to «Checking the fuel pump (FP)»(ref-441378-S26096443502011121500000)

Checking the fuel pump (FP)

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the Additional Heater is also used as a parking heater.

1. Ignition on.
2. Activate heater in order to start the pump. The pump does not start directly after starting the heater. Check if the fuel pump is operating, a "ticking" sound should be audible. If the pump is not working, install a new fuel pump.

Is the pump operating?

1. YES Refer to «Checking nozzle pipe»(ref-441378-S24796844722011121500000)
2. NO Refer to «Verification»(ref-441378-S16349118842011121500000)

Scheme 351

1. Remove heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) .
2. Disconnect nozzle pipe according to «Replacing fuel injection nozzle, fan motor and nozzle pipe»(ref-441328-S40600138662011121500000) . Check that the nozzle pipe seems OK and that it is not blocked. Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S16349118842011121500000)
2. NO Refer to «Checking intake air flow»(ref-441378-S09677607672011121500000)

Checking intake air flow

1. Remove heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) . Check that the air flow through the heater is free, that the air intake and exhaust are not blocked. Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S16349118842011121500000)
2. NO Refer to «Checking flame sensor»(ref-441378-S02076346222011121500000)

Checking flame sensor

Check if the flame sensor is clogged with soot.

Remedy as necessary.

Other information

1. To access/replace the flame sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S16349118842011121500000)
2. NO Refer to «Checking component and cables»(ref-441378-S05216103742011121500000)

Check cable between control module #4 and flame trap ground terminal for an open-circuit according to Open-circuit, permanent faults .

HINT: Because it is difficult to separate the flame sensor cables measure between control module #4 and both flame sensor cables.

Check cable between control module #8 and flame sensor signal terminal for an open-circuit according to Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: Because it is difficult to separate the flame sensor cables try to measure one flame sensor cable at a time and see if there is a relevant value on either of them.

If no fault is found in the connectors or cables, try a new flame sensor.

Note. Diagnostic trouble code (DTC) HEA-142 outside temperature sensor signal and/or HEA-801 Coolant temperature sensor signal can be stored if there is a fault in the ground lead.

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the flame sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .
3. With ignition on and flame sensor signal cable cut the voltage between flame sensor signal cable (engine control module (ECM) side) and ground should be approximately 5 V.
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Verification»(ref-441378-S16349118842011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
4. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S36045473462011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking the function of the combustion fan

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition on
2. Activate the combustion fan. Listen for a buzzing sound which indicates that the combustion fan is running.

Does the combustion fan function?

1. YES Refer to «Intermittent fault»(ref-441378-S23791936982011121500000)
2. NO Refer to «Checking components and wiring»(ref-441378-S21572254682011121500000)

Check the cable between control module terminal #10 and the signal terminal for the combustion fan (the black lead from the fan). Check for a short-circuit to supply voltage according to Short-circuit to ground, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000)
2. Remove the heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) to access the combustion fan. Remove the fan shroud.
3. With the ignition on and the combustion fan signal connection disconnected, the voltage between the combustion fan signal terminal (control module side) and ground should be approximately 0 V.
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S23645526262011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on
4. Activate the combustion fan. Listen for a buzzing sound which indicates that the combustion fan is running.

Does the combustion fan function?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S23645526262011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition on
2. Activate the combustion fan. Listen for a buzzing sound which indicates that the combustion fan is running.

Does the combustion fan function?

1. YES Refer to «Intermittent fault»(ref-441378-S34033388772011121500000)
2. NO Refer to «Checking the connectors»(ref-441378-S17077695422011121500000)

1. Ignition off
2. Check the electrical terminals on the combustion fan and the control module connector. Check for «Contact resistance and oxidation»(ref-441291-S41448420802011121500000) . Remedy if necessary. Check for damage carefully
3. Reinstall the components, reconnect the connectors etc.
4. Ignition on
5. Activate the combustion fan. Listen for a buzzing sound which indicates that the combustion fan is running. If the combustion fan now operates, the cause of the fault was loose connections in the connectors. Other information: To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) Remove the heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) to access the combustion fan. Remove the fan shroud.

Does the combustion fan function?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking components and wiring»(ref-441378-S34341368172011121500000)

Check the electrical terminals on the combustion fan and the control module connector. Check for contact resistance and oxidation according to Contact resistance and oxidation .

Check the cable between control module terminal #10 and the signal terminal for the combustion fan (the black lead from the fan). Check for an intermittent open-circuit according to Open-circuit, intermittent faults . Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Check the cable between control module terminal #11 and the voltage terminal for the combustion fan (the red cable from the fan). Check for an intermittent open-circuit according to Open-circuit, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000)
2. Remove the heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) to access the combustion fan. Remove the fan shroud
3. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S04216212262011121500000) OKAY: Troubleshooting has been completed.

HINT: After carrying out the repair, check that the fault has been remedied.

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on
4. Activate the combustion fan. Listen for a buzzing sound which indicates that the combustion fan is running.

Does the combustion fan function?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S04216212262011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition on
2. Activate the combustion fan. Listen for a buzzing sound which indicates that the combustion fan is running.

Does the combustion fan function?

1. YES Refer to «Intermittent fault»(ref-441378-S18277157222011121500000)
2. NO Refer to «Checking the connectors»(ref-441378-S41349168582011121500000)

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition off
2. Check the electrical terminals on the combustion fan and the control module connector. Check for «Contact resistance and oxidation»(ref-441291-S41448420802011121500000) . Remedy if necessary. Check for damage carefully
3. Reinstall the components, reconnect the connectors etc.
4. Ignition on
5. Activate the combustion fan. Listen for a buzzing sound which indicates that the combustion fan is running. If the combustion fan now operates, the cause of the fault was loose connections in the connectors. Other information: To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) Remove the heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) to access the combustion fan. Remove the fan shroud.

Does the combustion fan function?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Replacing the component»(ref-441378-S07028379272011121500000)

1. Ignition off. Try a new combustion fan according to «Replacing fuel injection nozzle, fan motor and nozzle pipe»(ref-441328-S40600138662011121500000) .

1. Continue Refer to «Verification»(ref-441378-S02482996002011121500000)

1. Ignition off. Check the electrical terminals on the combustion fan and the control module connector. Check for «Contact resistance and oxidation»(ref-441291-S00267239222011121500000) . Other information: To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) Remove the heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) to access the combustion fan. Remove the fan shroud.

1. Continue Refer to «Information»(ref-441378-S20744470492011121500000) OKAY: Troubleshooting has been completed.

HINT: After carrying out the repair, check that the fault has been remedied.

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on
4. Activate the combustion fan. Listen for a buzzing sound which indicates that the combustion fan is running.

Does the combustion fan function?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S20744470492011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking the function of the water pump

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition on
2. Activate the water pump. Listen for a buzzing sound which indicates that the water pump is running.

Does the water pump function?

1. YES Refer to «Intermittent fault»(ref-441378-S35096228782011121500000)
2. NO Refer to «Checking components and wiring»(ref-441378-S13563750322011121500000)

Check the cable between control module terminal #12 and water pump terminal 1. Check for an intermittent short-circuit to supply voltage according to Short-circuit to ground, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000)
2. To access or replace the water pump, see «Replacing the water pump»(ref-441328-S39846874622011121500000)
3. With ignition on and the water pump connector disconnected, the voltage between the water pump terminal 1 (engine control module (ECM) side) and ground must be approximately 0 V
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S01028806252011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on
4. Activate the water pump. Listen for a buzzing sound which indicates that the water pump is running.

Does the water pump function?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S01028806252011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition on
2. Activate the water pump. Listen for a buzzing sound which indicates that the water pump is running.

Does the water pump function?

1. YES Refer to «Intermittent fault»(ref-441378-S22174698462011121500000)
2. NO Refer to «Checking the connectors»(ref-441378-S39867476012011121500000)

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition off
2. Check the water pump and control module connector. Check for «Contact resistance and oxidation»(ref-441291-S41448420802011121500000) . Check for damage carefully
3. Reinstall the components, reconnect the connectors etc.
4. Ignition on
5. Activate the water pump. Listen for a buzzing sound which indicates that the water pump is running. If the water pump now functions, the cause of the fault was loose connections in the connectors. Other information: To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) To access or replace the water pump, see «Replacing the water pump»(ref-441328-S39846874622011121500000) .

Does the water pump function?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking components and wiring»(ref-441378-S42408528282011121500000)

Check the water pump and control module connectors. Check for Contact resistance and oxidation .

Check the cable between control module terminal #12 and water pump terminal 1. Check for an intermittent open-circuit according to Open-circuit, intermittent faults . Check for a short-circuit to ground according to Short-circuit to ground, intermittent faults .

Check the cable between control module terminal #11 and water pump terminal 2. Check for an intermittent open-circuit according to Open-circuit, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000)
2. To access or replace the water pump, see «Replacing the water pump»(ref-441328-S39846874622011121500000)
3. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S10490433102011121500000) OKAY: Troubleshooting has been completed.

HINT: After carrying out the repair, check that the fault has been remedied.

Note. On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. Individual components and functions cannot be activated when the +15 voltage supply is absent.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on
4. Activate the water pump. Listen for a buzzing sound which indicates that the water pump is running.

Does the water pump function?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S10490433102011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking the function of the fuel pump (FP)

1. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
2. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES Refer to «Intermittent fault»(ref-441378-S08811252472011121500000)
2. NO Refer to «Checking components and wiring»(ref-441378-S31318852002011121500000)

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the additional heater is also used as a parking heater.

Check the cable between control module terminal #13 and fuel pump (FP) terminal 2. Check for a short-circuit to supply voltage according to Short-circuit to ground, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000)
2. To access or reinstall the fuel pump (FP), see «Replacing the fuel pump»(ref-441328-S31136600142011121500000)
3. With the ignition on and the fuel pump (FP) connector disconnected, the voltage between fuel pump (FP) terminal 2 (control module side) and ground must be 0 V
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S40182242952011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
4. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S40182242952011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

1. Ignition on (with additional heater start the engine) NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
2. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES Refer to «Intermittent fault»(ref-441378-S20949962672011121500000)
2. NO Refer to «Checking the connectors»(ref-441378-S16603303222011121500000)

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the additional heater is also used as a parking heater.

1. Ignition off
2. Check the fuel pump (FP) and the control module connectors. Check for «Contact resistance and oxidation»(ref-441291-S41448420802011121500000) . Remedy if necessary. Check for damage carefully
3. Reinstall the components, reconnect the connectors etc.
4. Ignition on (with additional heater start the engine) NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
5. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) . If the heater now functions, the cause of the fault was loose connections in the connectors. Other information: To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) To access or replace the fuel pump (FP) see «Replacing the fuel pump»(ref-441328-S31136600142011121500000) .

Does the heater operate?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking the overheat protection thermostat»(ref-441378-S03045806602011121500000)

Scheme 352

1. Ignition off. Measure between the overheat protection thermostat terminals using an ohmmeter. The resistance must be approximately 0 ohms. The overheat protection thermostat must be replaced if the value is not correct. Other information: To access or replace the overheat protection thermostat, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S07017198272011121500000)
2. NO Refer to «Checking components and wiring»(ref-441378-S09640208232011121500000)

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the additional heater is also used as a parking heater.

Check the fuel pump (FP) and control module connectors. Check for Contact resistance and oxidation .

Check the cable between control module terminal #13 and fuel pump (FP) terminal 2. Check for an intermittent open-circuit according to Open-circuit, permanent faults . Check for a short-circuit to ground according to Open-circuit, permanent faults .

Check the cable between control module terminal #11 and water pump terminal 1. Check for an intermittent open-circuit according to Open-circuit, permanent faults .

Remedy as necessary.

Other information

1. To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000)
2. To access or replace the fuel pump (FP) see «Replacing the fuel pump»(ref-441328-S31136600142011121500000)
3. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S34605920042011121500000) OKAY: Troubleshooting has been completed.

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
4. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S34605920042011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking waterflow

Check if the lines to and from the heater are blocked or if the heater is damaged so that through flow is restricted in some way.

Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S04095490692011121500000)
2. NO Refer to «Checking coolant temperature sensor»(ref-441378-S19760347922011121500000)

Checking coolant temperature sensor

1. Start engine.
2. Read off coolant temperature in the heater. Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Is the temperature reading OK?

1. YES Refer to «Checking component and cables»(ref-441378-S25794938382011121500000)
2. NO Refer to «Checking component and cables»(ref-441378-S00187927232011121500000)

Check engine coolant temperature sensor resistance. For resistance values refer to Component resistance values .

Remedy as necessary.

Other information

1. To access/replace Coolant temperature sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .
2. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Verification»(ref-441378-S04095490692011121500000)

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the Additional Heater is also used as a parking heater.

Check fuel pump (FP) and control module connector for Contact resistance and oxidation .

Check cable between control module #13 and fuel pump (FP) terminal 1 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Check cable between control module #11 and fuel pump (FP) terminal 2 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Note. Diagnostic trouble code (DTC) HEA-815 Combustion fan signal and/or diagnostic trouble code (DTC) HEA-822 water pump signal is stored if there is a fault in the power cable.

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the fuel pump (FP) see «Replacing the fuel pump»(ref-441328-S31136600142011121500000) .
3. To access/replace the overheat protection thermostat see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .

1. Continue Refer to «Verification»(ref-441378-S04095490692011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
4. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S04764926282011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Check if the lines to and from the heater are blocked or if the heater is damaged so that through flow is restricted in some way.

Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S19800790442011121500000)
2. NO Refer to «Checking coolant temperature sensor»(ref-441378-S24629212332011121500000)

1. Start engine.
2. Read off coolant temperature in the heater. Check the engine coolant temperature (ECT) reading is correct. Compare with the actual coolant temperature of the engine.

Is the temperature reading OK?

1. YES Refer to «Checking component and cables»(ref-441378-S01273235582011121500000)
2. NO Refer to «Checking component and cables»(ref-441378-S00865420092011121500000)

Check engine coolant temperature sensor resistance. For resistance values, refer to Component resistance values .

Remedy as necessary.

Other information

1. To access/replace Coolant temperature sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .
2. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Verification»(ref-441378-S19800790442011121500000)

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the Additional Heater is also used as a parking heater.

Check fuel pump (FP) and control module connector for Contact resistance and oxidation .

Check cable between control module #13 and fuel pump (FP) terminal 1 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Check cable between control module #11 and fuel pump (FP) terminal 2 for an intermittent open-circuit according to Open-circuit, intermittent faults .

Note. Diagnostic trouble code (DTC) HEA-815 Combustion fan signal and/or diagnostic trouble code (DTC) HEA-822 water pump signal is stored if there is a fault in the power cable.

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the fuel pump (FP), see «Replacing the fuel pump»(ref-441328-S31136600142011121500000) .
3. To access/replace the overheat protection thermostat, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .

1. Continue Refer to «Verification»(ref-441378-S19800790442011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
4. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S31651013902011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking the ground terminals

Special tools

See 9511373

See 9813190

Connect the breakout box according to Connecting The Breakout Box .

1. Continue Refer to «Checking the ground terminal»(ref-441378-S27877401752011121500000)

Scheme 353

1. Ignition off.
2. Control module disconnected.
3. Switch off all equipment that takes power from the battery (courtesy lighting, radio etc). Connect an ohmmeter between terminal #3 on the breakout box and the battery negative terminal.

The ohmmeter should read approximately 0 ohms.

1. OK Refer to «Checking power supply»(ref-441378-S25710482332011121500000)
2. NOT OK Refer to «Checking for open-circuits, contact resistance and oxidation»(ref-441378-S34161158672011121500000)

Checking for open-circuits, contact resistance and oxidation

Check the heater ground terminal and cables for an open-circuit according to Open-circuit, permanent faults , check for Contact resistance and oxidation .

1. Continue Refer to «Verification»(ref-441378-S26563201422011121500000)

Checking power supply

1. Ignition on.
2. Connect a voltmeter between #11 and #3 on the breakout box. The voltmeter should read approximately 0 V.

Does the voltmeter read approximately 0 V?

1. YES Refer to «Intermittent fault»(ref-441378-S19450593492011121500000)
2. NO Refer to «Checking supply circuit»(ref-441378-S34937362922011121500000)

Checking supply circuit

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the Additional Heater is also used as a parking heater.

1. Ignition off.
2. Remove heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) . Check circuit between control module #11 and the components which are connected to the supply circuit (water pump terminal 2, fuel pump (FP) terminal 2 and combustion fan supply terminal) for a short-circuit to supply voltage according to «Short-circuit to ground, permanent faults»(ref-441291-S27984344722011121500000) . Remedy as necessary. Other information: To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) . To access/replace the water pump, see «Replacing the water pump»(ref-441328-S39846874622011121500000) . To access/replace fuel pump (FP), see «Replacing the fuel pump»(ref-441328-S31136600142011121500000) . To access/replace the blower fan, see «Replacing fuel injection nozzle, fan motor and nozzle pipe»(ref-441328-S40600138662011121500000) . With ignition on and water pump connector disconnected the voltage between the water pump terminal 1 (engine control module (ECM) side) and ground should be approximately 0 V. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Verification»(ref-441378-S12987921822011121500000)

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the Additional Heater is also used as a parking heater.

Check circuit between control module #11 and components which are connected to supply voltage (water pump terminal 2, fuel pump (FP) terminal 1 and combustion fan supply terminal) for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the water pump, see «Replacing the water pump»(ref-441328-S39846874622011121500000) .
3. To access/replace fuel pump (FP), see «Replacing the fuel pump»(ref-441328-S31136600142011121500000) .
4. To access/replace the blower fan see «Replacing fuel injection nozzle, fan motor and nozzle pipe»(ref-441328-S40600138662011121500000) .
5. With ignition on and water pump connector disconnected the voltage between the water pump terminal 1 (engine control module (ECM) side) and ground should be approximately 0 V.
6. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S01812352502011121500000)

Scheme 354

Is the test box connected to the control module?

1. YES Refer to «Checking power supply»(ref-441378-S25710482332011121500000)
2. NO Refer to «Connecting the breakout box»(ref-441378-S01015016562011121500000)

1. Ignition off.
2. Control module disconnected.
3. Switch off all equipment that takes power from the battery (courtesy lighting, radio etc). Connect an ohmmeter between #3 on the breakout box and battery negative terminal.

The ohmmeter should read approximately 0 ohms.

1. OK VERIFIED: Troubleshooting has been completed.
2. NOT OK Refer to «Information»(ref-441378-S01812352502011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off.
2. Breakout box connected.
3. Reinstall connectors, components etc.
4. Ignition on.
5. Connect a voltmeter between #11 and #3 on the breakout box. The voltmeter should read approximately 0 V

Does the voltmeter read approximately 0 V?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S01812352502011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking the power supply

1. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
2. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES Refer to «Intermittent fault»(ref-441378-S41132521322011121500000)
2. NO Refer to «Checking the connector»(ref-441378-S28642319152011121500000)

Checking the connector

1. Ignition off
2. Check the control module connector for «Contact resistance and oxidation»(ref-441291-S41448420802011121500000) . Check for damage carefully
3. Reinstall the components, reconnect the connectors etc.
4. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
5. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) . If the heater now functions, the cause of the fault was loose connections in the connector. Other information: To access the control module and connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .

Does the heater operate?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking the supply circuit»(ref-441378-S30710860222011121500000)

Checking the supply circuit

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the additional heater is also used as a parking heater.

1. Ignition off. Check the circuit between control module terminal #11 and the components which are connected to the supply circuit (water pump terminal 2, fuel pump (FP) terminal 2 and combustion fan supply terminal). Check for an open-circuit according to «Open-circuit, permanent faults»(ref-441291-S38831997352011121500000) . Check for a short-circuit to ground according to «Short-circuit to ground, permanent faults»(ref-441291-S27984344722011121500000) . Remedy as necessary. Other information: To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) To access or replace the water pump, see «Replacing the water pump»(ref-441328-S39846874622011121500000) To access or replace the fuel pump (FP), see «Replacing the fuel pump»(ref-441328-S31136600142011121500000) To access or replace combustion fan, see «Replacing fuel injection nozzle, fan motor and nozzle pipe»(ref-441328-S40600138662011121500000) For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Verification»(ref-441378-S25382416952011121500000)

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the additional heater is also used as a parking heater.

Check the control module connector for loose connections according to Contact resistance and oxidation . Also check for Contact resistance and oxidation .

Check the circuit between control module terminal #11 and the components which are connected to the supply circuit (water pump terminal 1, fuel pump (FP) terminal 2 and combustion fan supply terminal). Check for an intermittent open-circuit according to Open-circuit, intermittent faults . Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000)
2. To access or replace the water pump, see «Replacing the water pump»(ref-441328-S39846874622011121500000)
3. To access or replace the fuel pump (FP), see «Replacing the fuel pump»(ref-441328-S31136600142011121500000)
4. To access or replace combustion fan, see «Replacing fuel injection nozzle, fan motor and nozzle pipe»(ref-441328-S40600138662011121500000)
5. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S06945933762011121500000) OKAY: Troubleshooting has been completed.

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
4. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S06945933762011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Checking charge voltage

HINT: When the battery charger or start unit is connected to the battery it is important that the correct voltage is set.

HINT: Charging with too high a voltage can cause diagnostic trouble code (DTC) to be stored.

Scheme 355

1. Engine running.
2. Connect a voltmeter between battery terminals. Battery voltage should be less than 16 V.

Is the battery voltage OK?

1. YES Refer to «Intermittent fault»(ref-441378-S37596174122011121500000)
2. NO Refer to «Checking charging system»(ref-441378-S02511213142011121500000)

Checking charging system

Check charging system for excessive charge voltage, see relevant information.

1. Continue Refer to «Information»(ref-441378-S16455221422011121500000)

The control module has earlier registered too high voltage. This may have been caused by a battery charger with faulty voltage being connected to the battery or an intermittent fault in the charging regulator.

1. Continue Refer to «Information»(ref-441378-S16455221422011121500000)

In case of this defect, troubleshooting is not followed by verification.

The information can be displayed again or the fault-tracing for this fault can be interrupted.

Checking connector and cable

Note. If the control module does not have a connection to the relay for the blower fan then this diagnostic trouble code (DTC) can only be stored if there is a short-circuit between control module #2 and supply voltage in the control module connector. Check the control module connector #2 for any short-circuit to a supply voltage cable.

Check signal cable between control module #2 and the blower fan relay #4 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Remedy as necessary.

If no fault is found then the fault is probably intermittent.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

Was a fault detected?

1. YES Refer to «Information»(ref-441378-S05184795682011121500000)
2. NO FAULT NOT FOUND: Troubleshooting has been completed.

In case of this defect, troubleshooting is not followed by verification.

The information can be displayed again or the fault-tracing for this fault can be interrupted.

Note. If the control module does not have a connection to the relay for the blower fan then this diagnostic trouble code (DTC) can only be stored if there is a short-circuit between control module #2 and supply voltage in the control module connector. Check the control module connector #2 for any short-circuit to a supply voltage cable.

Check signal cable between control module #2 and the blower fan relay #4 for a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

Remedy as necessary.

If no fault is found then the fault is probably intermittent.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

Was a fault detected?

1. YES Refer to «Information»(ref-441378-S06039167522011121500000)
2. NO FAULT NOT FOUND: Troubleshooting has been completed.

In case of this defect, troubleshooting is not followed by verification.

The information can be displayed again or the fault-tracing for this fault can be interrupted.

Checking the function of the glow plug

1. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
2. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES Refer to «Intermittent fault»(ref-441378-S16739839862011121500000)
2. NO Refer to «Checking the connectors»(ref-441378-S22112364492011121500000)

1. Ignition off
2. Check the glow plug electrical terminal and control module connector. Check for «Contact resistance and oxidation»(ref-441291-S41448420802011121500000) . Check for damage carefully
3. Reinstall the components, reconnect the connectors etc.
4. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
5. Activate the heater. Check that the heater starts and runs. If the heater now functions, the cause of the fault was loose connections in the connectors. Other information: To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) To access the glow plug, see «Outside temperature sensor and glow plugs, replace»(ref-441328-S05161552132011121500000) .

Does the heater operate?

1. YES OKAY: Troubleshooting has been completed.
2. NO Refer to «Checking components and wiring»(ref-441378-S15200172552011121500000)

Check the control module connector and the electrical terminal for the glow plug. Check for loose connections according to Loose connections (terminals) . Check for Contact resistance and oxidation

Check the cable between control module terminal #1 and the glow plug terminal. Check for an intermittent open-circuit according to Open-circuit, intermittent faults . Check for an intermittent short-circuit to ground according to Short-circuit to ground, intermittent faults . Check for an intermittent short-circuit to supply voltage according to Short-circuit to supply voltage, intermittent faults .

Remedy as necessary.

Other information

1. To access the control module or connect the breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000)
2. To access the glow plug, see «Outside temperature sensor and glow plugs, replace»(ref-441328-S05161552132011121500000)
3. With the ignition on and the glow plug electrical terminal disconnected, the voltage between the glow plug electrical terminal (control module side) and ground must be approximately 9 V
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Information»(ref-441378-S25188922692011121500000) OKAY: Troubleshooting has been completed.

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
4. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S25188922692011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Fault-tracing for this diagnostic trouble code (DTC) can differ depending whether the heater is functioning as an Additional Heater or as a Parking heater as well.

The major difference between the two methods is that the Additional heater has the fuel pump (FP) installed at the heater and the fuel lines are connected to the return side on the engine fuel system at the engine. If the installation is used as a parking heater the fuel pump is installed at the fuel tank and the fuel lines are routed from the fuel tank to the heater, there is also a Timer installed in the passenger compartment.

Is the heater also used as a parking heater?

1. YES Refer to «Checking fuel lines, parking heater»(ref-441378-S06219516862011121500000)
2. NO Refer to «Checking fuel lines, additional heater»(ref-441378-S38001998682011121500000)

1. To expose the heater and get access to the fuel lines, refer to «Removing bumper»(ref-441328-S09218020772011121500000) . Check fuel lines between connection point at the engine fuel system and heater via fuel pump (FP), for damage and leakage. Also check fuel lines for blockage. Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S28740022702011121500000)
2. NO Refer to «Checking the fuel pump (FP)»(ref-441378-S30417146492011121500000)

1. To expose the heater and get access to the fuel lines, refer to «Removing bumper»(ref-441328-S09218020772011121500000) . Check fuel lines between fuel tank and heater via the fuel pump, for damage and leaks. Also check fuel lines for blockage. Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S28740022702011121500000)
2. NO Refer to «Checking the fuel pump (FP)»(ref-441378-S30417146492011121500000)

HINT: The fuel pump (FP) is installed in the fuel tank instead of on the heater when the Additional Heater is also used as a parking heater.

1. Ignition on.
2. Activate heater in order to start the pump. The pump does not start directly after starting the heater. Check if the fuel pump is operating, a "ticking" sound should be audible. If the pump is not working, install a new fuel pump.

Is the pump operating?

1. YES Refer to «Checking nozzle pipe»(ref-441378-S19020400682011121500000)
2. NO Refer to «Verification»(ref-441378-S28740022702011121500000)

Checking nozzle pipe

1. Remove heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) .
2. Disconnect nozzle pipe according to «Replacing fuel injection nozzle, fan motor and nozzle pipe»(ref-441328-S40600138662011121500000) . Check that the nozzle pipe seems OK and that it is not blocked. Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S28740022702011121500000)
2. NO Refer to «Checking intake air flow»(ref-441378-S17392774232011121500000)

1. Remove heater according to «Replacing heat exchanger»(ref-441328-S04127342072011121500000) . Check that the air flow through the heater is free, that the air intake and exhaust are not blocked. Remedy as necessary.

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S28740022702011121500000)
2. NO Refer to «Checking flame sensor»(ref-441378-S40238865432011121500000)

Check if the flame sensor is clogged with soot.

Remedy as necessary.

Other information

1. To access/replace the flame sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .

Was a fault detected?

1. YES Refer to «Verification»(ref-441378-S28740022702011121500000)
2. NO Refer to «Checking component and cables»(ref-441378-S40409540582011121500000)

Check cable between control module #4 and flame trap ground terminal for an open-circuit according to Open-circuit, permanent faults .

HINT: Because it is difficult to separate the flame sensor cables measure between control module #4 and both flame sensor cables.

Check cable between control module #8 and flame sensor signal terminal for an open-circuit according to Open-circuit, permanent faults and a short-circuit to supply voltage according to Short-circuit to supply voltage. Permanent faults .

HINT: Because it is difficult to separate the flame sensor cables try to measure one flame sensor cable at a time and see if there is a relevant value on either of them.

If no fault is found in the connectors or cables, try a new flame sensor.

Note. Diagnostic trouble code (DTC) HEA-142 outside temperature sensor signal and/or HEA-801 Coolant temperature sensor signal can be stored if there is a fault in the ground lead.

Remedy as necessary.

Other information

1. To access the control module/connect breakout box, see «Connecting The Breakout Box»(ref-441326-S01154722822011121500000) .
2. To access/replace the flame sensor, see «Overheating protection thermostat, flame sensor and Coolant temperature sensor, replace»(ref-441328-S21357157812011121500000) .
3. With ignition on and flame sensor signal cable cut the voltage between flame sensor signal cable (engine control module (ECM) side) and ground should be approximately 5 V.
4. For other values, see «Signal specification Additional heater 912-D/B»(ref-441327-S29371187082011121500000) .

1. Continue Refer to «Verification»(ref-441378-S28740022702011121500000)

HINT: After carrying out the repair, check that the fault has been remedied.

1. Ignition off
2. Reinstall the connectors, components etc.
3. Ignition on (with additional heater start the engine). NOTE: On cars where the heater functions as a parking heater there is no +15 voltage supply to the control module. The heater is activated using the timer stop and start buttons instead of VIDA vehicle communication. Individual components and functions cannot be activated when the +15 voltage supply is absent.
4. Activate the heater. Check the function of the heater according to «Test running the additional heater/parking heater»(ref-441329-S35477619402011121500000) .

Does the heater operate?

1. YES VERIFIED: Troubleshooting has been completed.
2. NO Refer to «Information»(ref-441378-S09886450952011121500000)

The fault should have been detected and remedied. As this is not the case fault-tracing has failed.

Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

In case of this defect, troubleshooting is not followed by verification.

The information can be displayed again or the fault-tracing for this fault can be interrupted.

This diagnostic trouble code (DTC) means that the control module in the factory registered a fault when the heater was started but that the fault is no longer present.