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Test 2: Gem Does Not Respond To NGS Tester

WARNING: This page is about a different car, the 1999 Mazda B4000, 1999 Mazda B3000, and 1999 Mazda B2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to OFF position. Disconnect GEM 26-pin harness connector (T-221). Inspect GEM connector and Data Link Connector (DLC) for physical damage, bent terminals, or corrosion. Repair connectors as necessary and retest system for normal operation. If connectors are okay, go to next step.
  2. Measure resistance of Light Blue/White wire between terminal No. 25 at GEM harness connector (T-221) and terminal No. 7 at DLC. See Figure and Fig 1 . If resistance is 5 ohms or less, replace GEM. Retest system for normal operation. If resistance is greater than 5 ohms, repair open in Light Blue/White wire between GEM connector and DLC. Retest system for normal operation.
Fig 1: GEM Harness Connector T-221 Terminals & RAP Module Harness Connector T-410
G98A04885Courtesy of MAZDA MOTORS CORP.
Fig 2: GEM Harness Connector T-223 Terminals & RAP Module Harness Connector T-409
G98E04887Courtesy of MAZDA MOTORS CORP.
Fig 3: GEM Harness Connector T-224 Terminals
G98G04888Courtesy of MAZDA MOTORS CORP.
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