Test 1: Pneumatic System Equipment Control Module

Connect harness adapter and breakout box to Pneumatic System Equipment (PSE) control module. Measure voltage between terminals No. 3 and 4, and between terminals No. 2 and 3 at breakout box. Battery voltage should exist. If battery voltage is as specified, test is complete. If battery voltage does not exist, check wiring. See WIRING DIAGRAMS .