Air Conditioning - Climate Control Self Diagnosis Guide

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Climate Control Self Diagnosis Guide - Mk3

Activation of self-diagnosis

On the E(A)TC module, PRESS the "OFF" and "FOOTWELL" buttons simultaneously for at least 2 seconds, then PRESS "AUTO" within 1.5 seconds.

The self-diagnosis which then starts lasts a few seconds. An animated display appears in the E(A)TC display during this time. Any faults found are displayed in the form of trouble codes. Example: First of all, "93" flashes for 2 seconds, then "42" flashes for 2 seconds - DTC 9342. If no faults are stored, then all of the segments in the display are actuated.

Diagnosis mode can be stopped at any time by PRESSING any button on the E(A)TC module.

Note: If the "DEFROST" button is pressed to end the diagnosis mode, all DTCs in the fault memory will be deleted!

Fault Codes

Self-test code B1200 / 9200

Description Internal control module fault

Action CLEAR fault memory. If the fault occurs again after a functional test, RENEW the E(A)TC module

Self-test code B1242 / 9242

Description Circuit of heater flap control

Action Go to Pinpoint Test D motor, recirculated air fault

Self-test code B1251 / 9251

Description Open circuit in interior

Action Go to Pinpoint Test M temperature sensor circuit

Self-test code B1253 / 9253

Description Short circuit in interior

Action Go to Pinpoint Test M temperature sensor circuit (short to ground)

Self-test code B1261 / 9261

Description Short circuit in sun load sensor

Action Go to Pinpoint Test L circuit (short to ground)

Self-test code B1262 / 9262

Description Circuit of defrost actuator motor

Action Go to Pinpoint Test E, faulty

Self-test code B1263 / 9263

Description Circuit of dashboard/footwell

Action Go to Pinpoint Test F actuator motor faulty

Self-test code B1342 / 9342

Description Internal control module fault

Action CLEAR fault memory. If the fault occurs again after a functional³ test, RENEW the E(A)TC module

Self-test code B1676 / 9676

Description Power supply voltage outside

Action CHECK charging system. For further tolerance information Section 414-00 If the charging system is OK, Go to Pinpoint Test J

Self-test code B2266 / A266

Description Air temperature flap positioning

Action Go to Pinpoint Test G motor circuit faulty

Self-test code B2297 / A299

Description Open circuit in the footwell outlet

Action Go to Pinpoint Test H temperature sensor circuit

Self-test code B2298 / A307

Description Short circuit in the footwell

Action Go to Pinpoint Test H outlet temperature sensor circuit(short to ground)

Self-test code A297

Description Open circuit in the dashboard

Action Go to Pinpoint Test I outlet temperature sensor circuit

Self-test code A298

Description Short in the dashboard outlet

Action Go to Pinpoint Test I temperature sensor circuit (short to ground)

Self-test code B2308 / A308

Description Interior temperature sensor blower

Action Go to Pinpoint Test N circuit faulty

Self-test code B2516 / A516

Description Heater blower control module

Action Go to Pinpoint Test K circuit faulty