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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 29 (MIRROR SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER MIRRORS - MEMORY FUNCTIONS INOPERATIVE
2009 Chevrolet Tahoe Base, 4.8 C

Power Mirrors - Memory Functions Inoperative

2009 Chevrolet Tahoe Base, 4.8 CSECTION Power Mirrors - Memory Functions Inoperative
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Power Mirrors - Memory Functions Inoperative

Step Action Value(s) Yes No
Schematic Reference: Outside Rearview Mirror Schematics 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Place the mirror select switch in the left mirror position.
  2. Activate the mirror position switch in the UP, DOWN, LEFT and RIGHT directions and note the operation.
  3. Place the mirror select switch in the right mirror position.
  4. Activate the mirror position switch in the UP, DOWN, LEFT and RIGHT directions and note the operation.
Do both power mirrors operate properly?		 - Go to Step 3  Go to Power Mirrors Inoperative 
3
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Monitor the Memory Switch data parameters.
Are any of the Memory Switch data parameters active without a switch activation?		 - Go to Step 5  Go to Step 4 
4
  1. Monitor the Memory Switch data parameters.
  2. Activate the memory 1, memory 2 and Exit switches one at a time.
Do all of the Memory Switch data parameters change state with the corresponding switch activation?		 - Go to Step 7  Go to Step 6 
5 Disconnect the memory switch.
Does the Memory Switch data parameter change to idle?		 - Go to Step 13  Go to Step 12 
6
  1. Disconnect the memory switch.
  2. Monitor the memory switch data parameter.
  3. Connect a 3-amp fused jumper between the memory switch battery positive voltage pin and each of the memory switch signal pins, one at a time, at the driver door switch (DDS).
Does the Memory Switch data parameter change state appropriately at each test point?		 - Go to Step 13  Go to Step 12 
7 With a scan tool, monitor the Mirror Horizontal and Vertical Position data parameters of the inoperative mirror while commanding the mirror to move with the mirror switch.
Do the Mirror Horizontal and Vertical Position data parameters change values with the corresponding mirror movement?		 - Go to Step 10  Go to Step 8 
8
  1. Disconnect the inoperative mirror.
  2. Measure the voltage between the mirror 5-volt reference circuit pin at the door module and a good ground.
Does the voltage measure within the specified range?		 4.75-5 V Go to Step 9  Go to Step 12 
9
  1. With a scan tool, monitor the Mirror Horizontal and Vertical Position data parameters.
  2. Connect a 3-amp fused jumper between the mirror 5-volt reference circuit pin and each of the horizontal and vertical position signal circuit pins at the door module one at a time.
Do the Mirror Horizontal and Vertical Position data parameters display within the specified range?		 4.75-5 V Go to Step 14  Go to Step 10 
10
  1. Connect the inoperative mirror.
  2. Backprobe the mirror 5-volt reference circuit with a DMM connected to a good ground.
  3. Monitor the voltage displayed on the DMM while commanding the mirror to the full up, down, left and right positions with the mirror position switch.
Does the measured voltage display greater than the specified value?		 5 V Go to Step 14  Go to Step 11 
11
  1. Command the mirror to move with the mirror switch to the full up and full left position.
  2. Press and hold the memory 1 switch until two audible tones are heard.
  3. With a scan tool, monitor and record the Mirror Horizontal and Vertical Position data parameter voltage values.
  4. Command the mirror to move with the mirror switch to the full down and full right position.
  5. Press and release the memory 1 switch.
Does the mirror recall to within 0.02 volt of the stored Mirror Horizontal and Vertical Position data parameter voltage values recorded earlier?		 Within 0.2 V Go to Testing for Intermittent Conditions and Poor Connections Go to Step 12 
12 Inspect for poor connections at the appropriate door switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 18  Go to Step 15 
13 Inspect for poor connections at the memory switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 18  Go to Step 16 
14 Inspect for poor connections at the appropriate mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 18  Go to Step 17 
15 Replace the appropriate door switch. Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?		 - Go to Step 18  -
16 Replace the memory switch. Refer to Heated Seat Switch Replacement - Front (w/o KB6) .
Did you complete the repair?		 - Go to Step 18  -
17 Replace the appropriate mirror. Refer to Motor Replacement - Power Mirror .
Did you complete the repair?		 - Go to Step 18  -
18 Operate the system in order to verify the repair.
Did you correct the condition?		 - System OK Go to Step 2 
RENDER: 1.0x

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