Pontiac FIREBIRD 1972 Service Manual page 1279

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CHASSIS ELECTRICAL
Turn column connector so that the lettered terminals
on its side are visible.
Put turn signal lever in center "Off' position.
Connect one end of continuity checker to terminal
"P" (Figure 12-12).
Touch other end of checker to terminal "M" and
check for continuity.
Move checker from "M" to "N" and check for con-
tinuity.
Put turn signal switch in "Right" turn.
Move continuity connection from "P" to "L".
Touch other end of checker to "J" and then to "N"
and check for continuity at each terminal.
Move checker from "L" to "P". Touch other end to
"M" and check for continuity.
Put turn signal switch in "Left" turn.
Touch checker to "N" and check for continuity.
Move checker from "P" to "L".
Touch other end to "H" and then to "M" and check
for continuity at each terminal.
Put turn signal to "Off' and turn H A Z A R D
SWITCH "On".
Move checker from "L" to "P".
Touch other end to J,
K,
H , M, N and check for
continuity at each terminal.
Turn "Off' Hazard Switch.
If cornering lights do not operate:
1. Move checker from "P" to "A".
2. Move turn signal switch to "Right" turn.
3. Touch other end of checker to "C" and check for
continuity.
4. Move turn signal switch to "Left" turn.
5. Touch other end of checker to "B" and check for
continuity.
Alternate Method
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Electrical Check of the Turn Signal
Switch
Another method of checking the Turn Signal Switch Sys-
tem is to substitute a known good switch without remov-
ing the one in the vehicle. (Method previously described
can be used to check switch out of vehicle.) Connect the
connector of the new switch into the chassis connector
and repeat the electrical function test. Lane change, turn
(Figure 12- 13) and hazard warning can all be actuated and
the systems' function checked. The horn operation can
also be checked by grounding the horn button to a
grounded metallic part of the vehicle. Horn circuit prob-
lems are generally associated with the cancel cam or steer-
ing wheel switches.
If all above systems operate correctly, the switch in the
vehicle is in need of repair or replacement.
Should part of the system still not function, that part will
have to be checked for shorts and the lamp receptacles
checked to insure proper grounding.
M E C H A N I C A L CHECK
1. If diagnostic procedures indicate the problem is in the
Fig. 12-1 2 Using Continuity Checker
Fig. 12-13 Alternate Checking Method Using Known Good
Switch