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• When Monitored: • Set Condition: Possible Causes ENGINE BRAKE DTC’S PRESENT ABS DTC’S PRESENT (B29) BRAKE SWITCH SIGNAL OPEN (B29) BRAKE SWITCH SIGNAL SHORT TO VOLTAGE SHIFTER LEVER ASSEMBLY Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - Theory of Operation The brake switch signal must be active before the shift lever can be moved out of the park position. The Shifter Diagnostic Test 1. ENGINE DTCs PRESENT With the scan tool, read Engine DTCs. Are there any Engine brake DTCs present? Yes >> Refer to 9 — ENGINE ELECTRICAL DIAGNOSTICS and perform the appropriate diagnostic procedure. Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/ No >> Go To 2 2. ABS MODULE DTCs PRESENT With the scan tool, read ABS Module DTCs. Are there any ABS DTCs present? Yes >> Refer to Section 5 - BRAKES - ABS ELECTRICAL DIAGNOSTICS and perform the appropriate diag- nostic procedure. Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/ No >> Go To 3 21 - 230 AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS LX |