DTC Troubleshooting: B1206 (F+AUTO)
|DTC B1206 or DTC indicator F and AUTO:||Climate Control Unit Lost Communication with Gauge Control Module (TACH) (ECT message)|
|1.||Clear the DTC with the HDS.|
|2.||Turn the ignition switch OFF, and then ON (II).|
|3.||Do the self-diagnostic with the HDS or climate control unit.|
|4.||Check the DTCs.|
Is DTC B1206, or F and AUTO indicated?
YES - Go to 5.
NO - intermittent failure, check for loose wires or poor connections on the gauge control module (TACH) and climate control unit circuit.n
|5.||Select UNIT INFORMATION in the BODY ELECTRICAL menu.|
|6.||Select CONNECTED UNIT in the UNIT INFORMATION menu.|
Is gauge control module detected?
YES - Substitute a known-good climate control unit, and recheck. If the sympton/indication goes away, replace the original climate control unit.n
NO - Go to 7.
|7.||Disconnect under-dash fuse/relay box connector Q (16P).|
|8.||Disconnect the gauge control module (TACH) 36P connector.|
|9.||Check for continuity between under-dash fuse/relay box connector Q (16P) terminal No. 6 and the gauge control module (TACH) 36P connector terminal No. 21.|
Is there continuity?
NO - Repair open in the wire between the MICU and the gauge control module (TACH).n