SYSTEM ID TEST 1A
Note. See BODY CONTROL COMPUTER - INTRODUCTION article before proceeding with following testing.
IDENTIFYING DIAGNOSTIC TROUBLE CODES
If scan tool displays fault messages in TEST 1A, record messages displayed and perform appropriate test(s) listed in SCAN TOOL MESSAGE DIRECTORY table.
| Scan Tool Display | Perform Test No. |
|---|---|
| A/C Control A/C Switch Failure | (1) |
| A/C Control EBL Switch Failure | (1) |
| A/C Control Blend Door Input Open Or Shorted To Ground | (1) |
| A/C Control Blend Door Input Shorted To Battery | (1) |
| A/C Control Mode Door Input Open Or Shorted To Battery | (1) |
| A/C Control Mode Door Input Shorted To Ground | (1) |
| ABS Bus Communication Failure | VEHICLE COMMUNICATIONS TEST 5A (3) |
| Air Bag Bus Communication Failure | VEHICLE COMMUNICATIONS TEST 2A (3) |
| Ambient Temperature Sensor Failure | OTIS TEST 2A |
| ATC Messages Not Received | VEHICLE COMMUNICATIONS TEST 3A (3) |
| ATC Switch Failure | (1) |
| Battery Power To Module Disconnected | VEHICLE COMMUNICATIONS TEST 4A (3) |
| BCM Bus Communication Failure | VEHICLE COMMUNICATIONS TEST 4A (3) |
| Blend Door Feedback Failure | (1) |
| Blend Door Output Shorted To Battery | (1) |
| Blend Door Output Shorted To Ground | (1) |
| Blend Door Stall Test Failure | (1) |
| Bus Shorted To Battery | VEHICLE COMMUNICATIONS TEST 13A (3) |
| Bus Shorted To Ground | VEHICLE COMMUNICATIONS TEST 14A (3) |
| Common Output Shorted To Battery | (1) |
| Common Output Shorted To Ground | (1) |
| Courtesy Lamp Output Short To Battery | INTERIOR LIGHT TEST 2A |
| Decklid Release Motor Output Failure | POWER DOOR LOCK TEST 18A |
| Decklid Release Switch Failure | POWER DOOR LOCK TEST 17A |
| Dimming Level Switch Input Failure | INSTRUMENT CLUSTER TEST 3A |
| EATX Bus Comm Failure | VEHICLE COMMUNICATIONS TEST 12A (3) |
| EEPROM Constant Checksum Failure | (2) |
| Evaporator Temperature Sensor Failure | (1) |
| Fuel Level Sending Unit Failure | INSTRUMENT CLUSTER TEST 2A |
| Headlamp Switch Input Failure | EXTERIOR LIGHT TEST 2A |
| In-Car Temperature Sensor Failure | (1) |
| Internal Base/Premium Select Failure | (2) |
| I/P Illumination Failure | INSTRUMENT CLUSTER TEST 9A |
| Left Central Lock/Unlock Switch Failure | POWER DOOR LOCK TEST 13A |
| MIC Messages Not Received | VEHICLE COMMUNICATIONS TEST 6A (3) |
| Mode Door Feedback Failure | (1) |
| Mode Door Output Shorted To Battery | (1) |
| Mode Door Output Shorted To Ground | (1) |
| Mode Door Stall Test Failure | (1) |
| OTIS Messages Not Received | VEHICLE COMMUNICATIONS TEST 8A (3) |
| Post Failure | (2) |
| Recirc Door Output Shorted To Ground | (1) |
| Recirc Door Output Shorted To Battery | (1) |
| Recirculation Door Test Failure | (1) |
| Right Central Lock/Unlock Switch Failure | POWER DOOR LOCK TEST 14A |
| RKE Unable To Enter Program Mode | POWER DOOR LOCK TEST 15A |
| RKE Program Mode Entered Without Program Request | POWER DOOR LOCK TEST 16A |
| SBEC Bus Communication Failure | VEHICLE COMMUNICATIONS TEST 9A (3) |
| Speed Proportional Steering Circuit Open Or Shorted To Ground | SPEED PROPORTIONAL STEERING TEST 2A |
| Speed Proportional Steering Circuit Shorted To Battery | SPEED PROPORTIONAL STEERING TEST 3A |
| Speed Proportional Steering Solenoid Over Temperature | SPEED PROPORTIONAL STEERING TEST 4A |
| Sun Load Sensor Failure | (1) |
| Wiper On/Off Relay Output Short High | WIPER TEST 4A |
| Wiper On/Off Relay Output Open Or Short Low | WIPER TEST 2A |
| Wiper Park Switch Failure | WIPER TEST 3A |
| (1) See appropriate article in A/C-HEATER SYSTEMS. (2) Replace body control module. (3) See appropriate VEHICLE COMMUNICATIONS article. | |
| (1) | See appropriate article in A/C-HEATER SYSTEMS. |
| (2) | Replace body control module. |
| (3) | See appropriate VEHICLE COMMUNICATIONS article. |
SCAN TOOL MESSAGE DIRECTORY
DIAGNOSING CHIME SYSTEM
Diagnosis of chime (warning) system is separated into 4 categories. Identify problem area(s) listed in CHIME TEST DIAGNOSTIC DIRECTORY table and perform the indicated test(s).
| Problem | Perform Test No. |
|---|---|
| Chime Inoperative At All Times | CHIME TEST 2A |
| Chime Inoperative With Exterior Lamps On | CHIME TEST 3A |
| Chime Inoperative With Driver's Seat Belt Unfastened | CHIME TEST 4A |
| Chime Inoperative With Key In Ignition Switch | CHIME TEST 5A |
| Chime Beep Request Inoperative (1) . | CHIME TEST 6A |
| (1) Chime will sound a short "beep" when request is received from Overhead Travel Information System (OTIS) or Automatic Temperature Control (ATC). | |
| (1) | Chime will sound a short "beep" when request is received from Overhead Travel Information System (OTIS) or Automatic Temperature Control (ATC). |
CHIME TEST DIAGNOSTIC DIRECTORY
SPEED PROPORTIONAL STEERING SYSTEM FUNCTIONAL TEST
Note. Perform SPEED PROPORTIONAL STEERING TEST 1A before proceeding with this test. For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST: VER-5A after each repair.
| CAUTION | Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector. |
- Start engine and turn steering wheel while monitoring amount of power steering assist. Using scan tool, de-activate Speed Proportional Steering (SPS) solenoid for 15 seconds. Turn steering wheel while monitoring amount of power steering assist. If steering has less power assist once SPS solenoid is de-activated, go to next step. If steering power assist is unchanged once SPS solenoid is de-activated, go to appropriate STEERING article.
- System is currently operating correctly. Inspect condition of Body Control Module (BCM) internal 20-pin connector. Body Control Module (BCM). BCM is mounted to junction block located behind left end cap of instrument panel. (Схема №1) Inspect SPS solenoid harness connector. Connector is located next to master cylinder. Clean and repair either connection as needed.
BODY VERIFICATION TEST
- Reconnect all previously disconnected components and connectors. If BCM was replaced, turn ignition on for at least 15 seconds. Program all RKE transmitters, recalibrate HVAC doors and program other options as necessary.
- If vehicle is equipped with VTSS, select MISCELLANEOUS and ENABLE VTSS. If battery was disconnected, start engine and recalibrate HVAC doors using scan tool.
- Ensure ignition is on. Erase all DTCs using scan tool. Turn ignition off and wait 5 seconds. Turn ignition on and fully operate system that was malfunctioning.
- If system is not operating properly, go to «SYMPTOM ID TEST 1A»(ref-679-S13732415342000031300000) . Using scan tool, read Body DTCs. If any DTCs are present, go to «SYMPTOM ID TEST 1B»(ref-679-S30986765722000031300000) . If no DTCs are present, system is operating correctly and customer's complaint cannot be duplicated, repair is complete.
VTSS VERIFICATION TEST
Ensure all doors, trunk and hood are closed. Open driver's door. Remove ignition key. Lock doors with power lock switch. Close driver's door. If instrument panel VTSS indicator light flashes, system is operational. If instrument panel VTSS indicator light does not flash, go to VTSS TEST 1A .
MEMORY SYSTEM VERIFICATION TEST
Reconnect all previously disconnected components and connectors. Using scan tool, erase memory system DTCs. Operate power seat in all positions. Reset seat mirrors in both memory positions. Operate both seat heaters low and high. Using scan tool, read DTCs. If no DTCs are present, repair is complete. If any DTCs are present, go to MEMORY SYSTEM TEST 1A .
SPEED PROPORTIONAL STEERING SYSTEM VERIFICATION TEST
Reconnect all previously disconnected components and connectors. Using scan tool, erase DTCs. Using scan tool, read DTCs. If any DTCs are present, go to SPEED PROPORTIONAL STEERING TEST 1A . If no DTCs are present, road test vehicle for at least 15 minutes. Perform several steering maneuvers at various speeds. Using scan tool, read DTCs. If any DTCs are present, go to SPEED PROPORTIONAL STEERING TEST 1A . If no DTCs are present, repair is complete.