Cell Phone - Poor Signal Strength
Date: October 25, 2004Order No.: P-B-82.70/377a
Supersedes: P-B-82.70/377 dated Sept. 17, 2004
Group: 82
Revision:
Repair Procedure Updated Step 7/ Parts Information Updated
SUBJECT:
Model 203.040/061/064/076/261/281/740/764. Equipped with Tele-Aid (code 359) and Integrated Telephone
Model 209.365/375/376/465/475/476, Equipped with Integrated Telephone
Model Year 2005 Poor Telephone Signal Strength
Note:
This DTB does not apply to vehicles not equipped with Tele-Aid (N123/4).
If you receive customer reports in the above model vehicles of poor or no signal in the integrated telephone system, follow the below procedure to resolve.
1) Check the version coding using SDS by following - Control Units --> Information and communication --> Audio, video, navigation and Telematics --> TELE-AID --> Control unit adaptations --> Model series, telephone adapter for portable CTEL
2) Verify that the following are correctly configured, print out screen and retain in repair order file.
a. 203 Wagon - Coded for S203
b. 203 Sedan - Coded for W203
c. 203 Coupe - Coded for C203
d. 209 Cabriolet - Coded for VV203
e. 209 Coupe - Coded for VV203
3) With the version coding correctly configured, check the vehicle Tele-Aid harness (part no. A203 540 86 33) by proceeding with step 4.
4) Remove the trunk floor and side covers using the following WIS procedures:
a. 203 Wagon - AR68.30-P-4780PA
b. 203 Sedan - AR68.30-P-4600P
c. 203 Coupe - AR68.30-P-4600PB
d. 209 Cabriolet - AR68.30-P-4600QA
e. 209 Coupe - AR68.30-P-4600PB
5) Remove connector 1 from the Digital Tele-Aid Module (N123/4) (Figure 1).
Note:
Connector 1 (Figure 1) may be either black or blue in color.
6) Open the pin housing on the harness side of the connector to determine if pin 14 is occupied.
a. If there is no wire going to pin 14 (Figure 2) on the connector to Digital Tele-Aid (N123/4) then proceed to step 7.
b. If pin 14 is occupied verify that the wire on pin 14 goes to pin 3 (violet wire) of the connector to the linear compensator (A28/3) and pin 28 (violet wire) of the Universal Handy Interface (N123/1). If it does not, contact the Technical Assistance Center (TAC) for further diagnostic assistance.
7) Install Repair Cable Harness (part number A203 440 32 07)
a. Determine the color of the pin housing. If the pin housing is blue, use the ELO pin contact (Figure 3). If the pin housing is black, use the MQS contact (Figure 3).
b. Cut the contact off the unused wire and properly terminate.
c. Insert pin into slot 14 of pin housing.
d. Replace connector lock over pin housing.
e. Route remaining wire along vehicle harness (A203 540 85 33) toward left trunk well to the linear compensator. Wire tie where necessary.
f. Detach linear compensator connector from linear compensator.
g. Locate opposite side of repair harness where female and male linear compensator power connectors are positioned.
h. Connect vehicle harness male linear compensator connector into female connector of repair harness and then connect male connector or repair harness into linear compensator (Figure 4).
8) Test repair
a. With Tele Aid module unplugged and phone in the cradle, select TEL mode on COMAND or Audio 20 head unit. Note the signal strength bars on display.
b. Turn off COMAND or Audio 20.
C. Plug in Tele-Aid harness into the Tele-Aid module (N123/4).
d. Turn COMAND or Audio 20 back on and back to TEL screen. The signal strength should now be at a higher level than in the previous test.
Note:
There may be no noticeable increase in signal strength when in close proximity to a Cell Site/Tower.
Parts Information
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair.
In Case of Warranty, use the table.