Component Testing
WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF. Disconnect the X176 24-way harness connector at the transmission.
- Install the DT-48493 jumper harness to the transmission side only.
- Disconnect the X1 16-way harness connector at the transmission.
- Install the DT-47825-10 jumper harness to the transmission side only.
- Transmission in PARK, test for less than 10 Ω between the low reference circuit terminal 5 at the transmission and each signal circuit terminal listed below at the transmission:
- Terminal D2 X176
- Terminal R2 X176
- Terminal S X16
- If not within the specified range, test the transmission internal extension harness signal circuit for an open/high resistance, if the circuit tests normal replace the automatic transmission internal B15 mode switch.
- Test for infinite resistance between the low reference circuit terminal 5 at the transmission and each signal circuit terminal listed below at the transmission:
- Terminal D1 X176
- Terminal R1 X176
- If not the specified value, test the transmission internal extension harness signal circuit for a short to ground, if the circuit tests normal replace the automatic transmission B15 internal mode switch.
- Parking brake applied with the transmission in NEUTRAL, test for less than 10 Ω between the low reference circuit terminal 5 at the transmission and each signal circuit terminal listed below at the transmission:
- Terminal D1 X176
- Terminal R1 X176
- If not within the specified range, test the transmission internal extension harness signal circuit for an open/high resistance, if the circuit tests normal replace the automatic transmission B15 internal mode switch.
- Test for infinite resistance between the low reference circuit terminal 5 at the transmission and each signal circuit terminals listed below at the transmission:
- Terminal D2 X176
- Terminal R2 X176
- If not the specified value, test the transmission internal extension harness signal circuit for a short to ground, if the circuit tests normal replace the automatic transmission B15 internal mode switch.
- Transmission in REVERSE, test for infinite resistance between the low reference circuit terminal 5 at the transmission and the signal circuit terminal 3 X1 at the transmission.
- If not the specified value, test the transmission internal extension harness signal circuit for an open/high resistance, if the circuit tests normal replace the automatic transmission B15 internal mode switch.