Preparation for Test: 1. Insert module specific module into HHT 2. Battery voltage 11 - 14 V, 3. Fuses ok, 5. Connect socket box with test cable according to connection diagram, see 22, Figures 1, 2 and 3 accordingly, for model being tested. 6. Review section 0, 11, 12, 20, 21, 22, 31, 32 ,Electrical Wiring Diagrams: See Electric Troubleshooting Manual, Model 129, Volume 2, group 80, Model 140, Volume 2, group 80, Model 170, Volume 2, group 80

Test equipment; See MBUSA Standard Service Equipment Program

Description	Brand, model, etc.
Digital multimeter	Fluke models 23, 77 III, 83, 85, 87

Connections - PSE control module Figure 4 1 Connector 1 (control line PSE) 2 Connector 2 (voltage supply PSE) 3 Connector 3 (control line ATA) 4 Connector 4 (load connections ATA)