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Test N Unable To Enter Service Bay Diagnostics

  1. If another SUPER STAR II tester is available, attempt to rerun SERVICE BAY DIAGNOSTICS. If still unable to enter SERVICE BAY DIAGNOSTICS, go to TEST M (CODE 80), BATTERY VOLTAGE LOW to check module power and ground. If problem is detected and repaired during TEST M, repeat SERVICE BAY DIAGNOSTICS under TESTING & DIAGNOSIS. If no problem is detected during TEST M, go to next step.
  2. Disconnect control module connectors. Check continuity of circuits No. 419 (Dark Green/Light Green wire), 432 (Black/Pink wire) and 844 (Gray/Red wire) between control module connectors and diagnostic connector. See Fig 1 . If continuity exists in all circuits, go to next step. If continuity does not exist in one or more circuits, repair open in circuits as necessary.
    Fig 1: Diagnostic Connector Check
    G92H04025
  3. Measure voltage between diagnostic connector circuit No. 419 (Dark Green/Light Green wire) and ground. Measure voltage between diagnostic connector circuit No. 844 (Gray/Red wire) and ground. Both circuits should indicate zero volts. If both circuits indicate zero volts, go to next step. If battery voltage is indicated in circuits No. 419 and/or 844, repair short circuit to battery as necessary. See Figure .
  4. Measure resistance between diagnostic connector circuit No. 419 (Dark Green/Light Green wire) and ground. Measure resistance between diagnostic connector circuit No. 844 (Gray/Red wire) and ground. Resistance should be greater than 10,000 ohms. See Figure . If resistance is greater than 10,000 ohms for both circuits, go to step 5). If resistance is 10,000 ohms or less in either circuit, repair short to ground as necessary.
  5. Disconnect positive battery cable. Measure resistance between pin No. 1 on Gray module connector and positive battery terminal. If resistance is less than 5 ohms, replace control module. If resistance is 5 ohms or greater, repair open or poor connection in battery power circuits.
NOTE: Repeat SERVICE BAY DIAGNOSTICS under TESTING & DIAGNOSIS to verify repairs.
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