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Hybrid Engine Controls - Repair Instructions: Other GMC Yukon III

Engine Control Systems 1 illustration ~332 words

Vehicle Collision Detection

This vehicle contains a high voltage circuit impact detection (HVCID) sensor in addition to the supplemental inflatable restraint (SIR) impact sensors. The SIR sensors are designed to identify the severity of a collision and from what direction a collision has occurred. The SIR sensors typically detect collision conditions for occupant impact-protection reasons. The HVCID sensor is located in the front of the vehicle and is designed to detect an offset collision that may have damaged the high voltage system. The drive motor generator control module, also called the hybrid powertrain control module (HPCM), will open the high voltage contactor relays and disable the vehicle whenever an SIR deployment occurs or the HVCID sensor detects a collision event. The HVCID sensor detection of a vehicle impact does not cause SIR deployment.

The serial data gateway module (SDGM) monitors the HVCID sensor for collision/impact detection and operational status. The SDGM transmits a GMLAN message to the HPCM whenever an HVCID impact event or sensor fault is detected.

A complete inspection of the high voltage (HV) system and components must be performed if the vehicle has been involved in a collision. The HVCID sensor and/or SIR Deployed vehicle-disable condition will remain active until cleared by the HPCM output control function of the scan tool.

HVCID and/or SIR Deployed Vehicle Disable Condition Clearing Procedure

  1. Perform the Inspection Procedure if the vehicle has been involved in a collision.
  2. Ignition ON, clear the SDGM vehicle disable condition with a scan tool. If the SDGM had a HVCID sensor fault DTC, repair the condition and clear SDGM DTC Information. If the SDGM had an HVCID collision detection condition, perform the SDGM Crash Sensor Reset special function.
  3. Ignition OFF, wait 2 minutes.
  4. Ignition ON, clear the HPCM vehicle disable condition with the scan tool HPCM Clear 300V Impact Detection Status special function.
  5. Ignition OFF, wait 2 minutes.
  6. Perform the HV Enable Procedure. Refer to «High Voltage Enabling»(ref-364532-S08767662232010063000000) .

Scheme 1

Scheme 1: High Voltage Circuit Impact Detection Sensor Replacement
Scheme 1: High Voltage Circuit Impact Detection Sensor Replacement
CalloutComponent Name
Preliminary Procedure Turn the ignition switch to the off/lock position, remove the ignition key and secure in technicians pocket until procedure is complete. Remove the engine protection shield. Refer to Engine Shield Replacement .
1High Voltage Circuit Impact Detection Sensor CAUTION: Refer to Fastener Caution . Procedure Disconnect the electrical connection. Loosen the sensor bolt. Tip: The bolt is an integral part of the sensor and should remain with the sensor. Tighten: 10 N.m (89 lb in)
CAUTION
Refer to Fastener Caution .

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