STI Home

Printable version

LOCATION:

4.5 Antenna Systems (AS)    >   23 Electrical Test Program - Test

Test scope Test connection Test condition Nominal value Possible cause/Remedy 1.0 High frequency (HF) antenna cable from amplifier (A2/26) to radio (A2) Continuity Short circuit (inner shielding/signal wire) Radio (A2): OFF Disconnect antenna cable from radio (A2) and left rear antenna amplifier (A2/26), see Figure 1 < 10 Wiring. 2.0 Radio (A2) Control voltage W0 A2/26 b Disconnect connector atleft rear antenna amplifier (A2/26), see Figure 1 Radio (A2): ON 11 - 14 V Wiring, Radio (RD), 3.1 23 or AD82.60 in WIS 3.0 Left rear antenna amplifier (A2/26) Current draw A2/26 A2 Connect ampmeter between (A2/26) and control voltage wire from radio (A2), see Figure 1 Radio (A2): ON 45 - 55 mA Ground connection for left rear antenna amplifier A2/26, 4.0 , If nominal value is ok, but poor reception quality continues: Swap A2/26 with known good unit and perform 11 Function Test. If no improvement, replace rear bumper antenna. 4.0 Ground connection Left rear antenna amplifier (A2/26) A2/26 Radio (A2): OFF Hint: Do not loosen mounting connection on A2/18. Mounting connection also serves as ground. < 1 Contact resistance at ground.