Preliminary work: Diagnosis - Diagnostic Trouble Code (DTC) Memory 12

Preparation for Test: 1. Fuses OK. 2. Battery voltage >11 V. 3. Install model specific HHT module into HHT. 4. Voltage to control modules and CAN data lines ok. 5. Connect the Hand-Held Tester (HHT) to X11/4, according to diagram, see section 0. Electrical wiring diagrams: Electrical Troubleshooting Manual, Model 202 and 208, Volume 2, group 80, Model 210, Volume 2, group 80

Conventional tools, test equipment

Description	Brand, model, etc.
Multimeter 1)	Fluke models 23, 83, 85, 87, 88

1) Available through the MBUSA Standard Equipment Program.